Subjects -> EARTH SCIENCES (Total: 771 journals)
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OCEANOGRAPHY (88 journals)

Showing 1 - 79 of 79 Journals sorted by number of followers
Deep Sea Research Part II: Topical Studies in Oceanography     Hybrid Journal   (Followers: 28)
Estuaries and Coasts     Hybrid Journal   (Followers: 25)
Limnology and Oceanography     Hybrid Journal   (Followers: 25)
Hydrobiology     Open Access   (Followers: 25)
Deep Sea Research Part I : Oceanographic Research Papers     Hybrid Journal   (Followers: 23)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 21)
Frontiers in Marine Science     Open Access   (Followers: 20)
New Zealand Journal of Marine and Freshwater Research     Hybrid Journal   (Followers: 19)
Journal of Marine Biology & Oceanography     Hybrid Journal   (Followers: 19)
Progress in Oceanography     Hybrid Journal   (Followers: 18)
Journal of Marine Sciences     Open Access   (Followers: 18)
Coastal Engineering     Hybrid Journal   (Followers: 16)
Advances in Oceanography and Limnology     Open Access   (Followers: 16)
Maritime Studies     Open Access   (Followers: 13)
Journal of Oceanography     Hybrid Journal   (Followers: 12)
Advances in Statistical Climatology, Meteorology and Oceanography     Open Access   (Followers: 10)
Bulletin of Marine Science     Full-text available via subscription   (Followers: 9)
Atmospheric and Oceanic Science Letters     Open Access   (Followers: 9)
Fisheries Oceanography     Hybrid Journal   (Followers: 8)
International Journal of Oceanography     Open Access   (Followers: 8)
Physical Oceanography     Hybrid Journal   (Followers: 6)
Open Journal of Marine Science     Open Access   (Followers: 6)
Limnology and Oceanography: Fluids and Environments     Full-text available via subscription   (Followers: 6)
Journal of Oceanography and Marine Science     Open Access   (Followers: 6)
Oceanography : Open Access     Open Access   (Followers: 6)
Limnology and Oceanography: Methods     Hybrid Journal   (Followers: 6)
Paleoceanography and Paleoclimatology     Full-text available via subscription   (Followers: 5)
Marine Science     Open Access   (Followers: 5)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 4)
Journal of Marine Science and Engineering     Open Access   (Followers: 4)
Ocean Yearbook Online     Hybrid Journal   (Followers: 4)
Limnology and Oceanography Letters     Open Access   (Followers: 4)
African Journal of Marine Science     Hybrid Journal   (Followers: 3)
Journal of Marine Science and Application     Hybrid Journal   (Followers: 3)
Oceanology     Hybrid Journal   (Followers: 3)
Journal of Operational Oceanography     Hybrid Journal   (Followers: 3)
Journal of Coastal Development     Open Access   (Followers: 3)
Ciencias Marinas     Open Access   (Followers: 3)
Journal of Aquatic Sciences     Full-text available via subscription   (Followers: 3)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 3)
Limnology and Oceanography e-Lectures     Open Access   (Followers: 3)
Development and Applications of Oceanic Engineering     Open Access   (Followers: 2)
Indian Journal of Geo-Marine Sciences     Open Access   (Followers: 2)
Regional Studies in Marine Science     Hybrid Journal   (Followers: 2)
Limnology and Oceanography: Bulletin     Hybrid Journal   (Followers: 2)
Mediterranean Marine Science     Open Access   (Followers: 2)
Annals of Marine Science     Open Access   (Followers: 2)
Annals of Limnology and Oceanography     Open Access   (Followers: 2)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 1)
Scientia Marina     Open Access   (Followers: 1)
Western Indian Ocean Journal of Marine Science     Open Access   (Followers: 1)
Marine Technology Society Journal     Full-text available via subscription   (Followers: 1)
Journal of Ocean Engineering and Science     Open Access   (Followers: 1)
Ocean Life     Open Access   (Followers: 1)
Acta Aquatica : Aquatic Sciences Journal     Open Access   (Followers: 1)
Journal of Ocean Engineering and Technology     Open Access   (Followers: 1)
Tropical Oceanography     Open Access   (Followers: 1)
Marine Systems & Ocean Technology     Hybrid Journal   (Followers: 1)
Marine Life Science & Technology     Hybrid Journal   (Followers: 1)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 1)
Asian Journal of Fisheries and Aquatic Research     Open Access  
Thalassas : An International Journal of Marine Sciences     Hybrid Journal  
Oceans     Open Access  
Aquatic Research     Open Access  
Jurnal Kelautan Tropis     Open Access  
Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan     Open Access  
Journal of Agricultural and Marine Sciences     Open Access  
Turkish Journal of Maritime and Marine Sciences     Open Access  
Arquivos de Ciências do Mar     Open Access  
Scientific Drilling     Open Access  
Jurnal Kelautan : Indonesian Journal of Marine Science and Technology     Open Access  
Oceanologia     Open Access  
Revista de Gestão Costeira Integrada     Open Access  
Revista Ciencias Marinas y Costeras     Open Access  
Egyptian Journal of Aquatic Research     Open Access  
China Ocean Engineering     Hybrid Journal  
Revista de Biología Marina y Oceanografía     Open Access  
Latin American Journal of Aquatic Research     Open Access  
Acta Oceanologica Sinica     Hybrid Journal  
Similar Journals
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Jurnal Kelautan Tropis
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1410-8852 - ISSN (Online) 2528-3111
Published by Diponegoro University Homepage  [16 journals]
  • Analisis Kesesuaian Habitat Peneluran Penyu Sisik (Eretmocheyls imbricata)
           di Pantai Batu Hitam dan Pantai Bama, Taman Nasional Baluran, Situbondo

    • Authors: Yusril Zaqi Ubaydillah, Defri Yona, Rarasrum Dyah Kasitowati
      Pages: 203 - 214
      Abstract: Hawksbill turtles were observed nesting along the coast of Baluran, mainly at Batu Hitam Beach. The eggs were relocated to a hatchery on Bama Beach, which is a beach where hawksbill turtles have never been seen laying eggs naturally. Referring to the natal homing/philopatry hypothesis, hatchlings that are released on Bama Beach will likely come back to lay eggs in the future. Meanwhile, Batu Hitam Beach is planned to be developed into a tourist area. To preserve this important nesting area, a nesting habitat suitability assessment is needed that can contribute to effective conservation planning and management. This study used observational data to identify the bio-physical characteristics of the beaches and analyzed them using the habitat suitability index (HSI). The parameters observed were the width and slope of the beach, percentage of sand, intensity of light, coastal vegetation, percentage of buildings, and the distance between the nesting beach and the feeding area. There were no significant differences in bio-physical characteristics between the two beaches. Except for beach width, all other parameters are given the same score. Batu Hitam Beach has a slightly wider and steeper beach than Batu Hitam Beach.  Based on the results of an assessment utilizing the habitat suitability index (HSI) for hawksbill nesting sites, the biophysical conditions of Bama Beach and Batu Hitam Beach were assessed as very suitable (>68.86%). Despite Bama Beach's suitability, there have been no reports of hawksbill turtles nesting there. The width of the beach that is too narrow and a lack of coastal vegetation shade are thought to have forced the hawksbill to prefer other locations, such as Batu Hitam Beach.  Penyu sisik teramati bertelur di sepanjang pesisir Baluran, terutama di Pantai Batu Hitam. Telur yang ditemukan dipindahkan ke tempat penetasan di Pantai Bama, pantai yang belum pernah tercatat penyu bertelur secara alami. Merujuk pada hipotesis natal homing/philopatry, tukik yang dilepasliarkan di Pantai Bama dimungkinan akan kembali untuk bertelur di kemudian hari. Di sisi lain, Pantai Batu Hitam rencananya akan dikembangkan menjadi kawasan wisata. Untuk melestarikan habitat peneluran ini, diperlukan penilaian kesesuaian habitat bersarang yang dapat berkontribusi pada perencanaan dan pengelolaan konservasi yang efektif. Penelitian ini menggunakan pendekatan observasional untuk mengidentifikasi karakteristik bio-fisik pantai dan menganalisisnya menggunakan indeks kesesuaian habitat (IKH). Parameter yang diamati adalah lebar dan kemiringan pantai, persentase pasir, intensitas cahaya, vegetasi pantai, persentase bangunan, dan jarak antara pantai peneluran dengan area pakan. Tidak terdapat perbedaan kondisi bio-fisik yang signifikan antara kedua pantai tersebut. Seluruh parameter mendapatkan skor yang sama, kecuali lebar pantai. Pantai Batu Hitam memiliki pantai yang sedikit lebih lebar dan lebih curam daripada Pantai Batu Hitam. Berdasarkan hasil penilaian dengan memanfaatkan Indeks Kesesuaian Habitat (IKH) peneluran penyu sisik, kondisi bio-fisik Pantai Bama dan Pantai Batu Hitam dinilai sangat sesuai (>68,86%). Meskipun hasil penilaian kondisi Pantai Bama sesuai menjadi habitat peneluran, belum ada laporan penyu sisik bertelur di sana. Lebar pantai yang terlalu sempit dan kurang meratanya naungan vegetasi pantai diduga menjadi penyebab penyu sisik memilih pantai lain di sekitar Pantai Bama, salah satunya adalah Pantai Batu Hitam.
      PubDate: 2023-06-06
      DOI: 10.14710/jkt.v26i2.15733
      Issue No: Vol. 26, No. 2 (2023)
       
  • Biological Aspects and Feeding Habits of Spinetail Devil Ray (Mobula
           mobular) landed in the Palabuhanratu Nusantara Fishing Port

    • Authors: Fahira Anggi Novyanti, Selvia Oktaviyani, Moch. Rudyansyah Ismail, Yuniarti M.S., Alexander M.A Khan
      Pages: 215 - 222
      Abstract: Optimal management of aquatic resources requires a good understanding of the biological aspects and other information related to these resources. This study was conducted to determine the biological aspects and feeding habits of Mobula mobular landed in the Palabuhanratu Nusantara Fishing Port. The research was conducted from September 2021 to May 2022. Data collected through a direct survey that included aspects of biology, stomach contents and information on fishing grounds. It was recorded that 21 individuals of M. mobular landed in the area during the study period. According to the Chi-Square test, the sex ratio between females and males is balanced with the growth pattern of M. mobular was negatively allometric. The male of M. mobular was generally found as immature individuals. The prey items identified in the stomachs belong to five groups: decapods, copepods, gastropods, Polychaeta, and others. Decapods were the most important prey (Index of Relative Importance 99,54%), while the other prey groups were only as complementary food. M. mobular is categorized as a plankton feeder. The fullness index value was 23.8%, while the vacuity index was 76.2% and categorized as relatively low fed. M. mobular is classified as an omnivorous animal that tends to be carnivorous with an animal preference with a trophic value of level 3.
      PubDate: 2023-06-06
      DOI: 10.14710/jkt.v26i2.16068
      Issue No: Vol. 26, No. 2 (2023)
       
  • Analisis Multivariat pada Struktur Komunitas Mangrove di Kecamatan Rupat
           Utara Kabupaten Bengkalis Provinsi Riau

    • Authors: Syahrial Syahrial, Muhammad Hatta, Chandrika Eka Larasati, Arina Ruzanna, Al Muzafri, La Ode Abdul Fajar Hasidu, Windi Syahrian, Zan Zibar
      Pages: 223 - 237
      Abstract: Increasing human activity in all aspects of life has contributed to the decline of mangrove forests, a multivariate analysis study on the structure of the mangrove community was conducted in July 2018 in North Rupat District, Bengkalis Regency, Riau Province with the objective of estimating or assessing the condition of the mangrove community structure. Data on the condition of mangrove vegetation was collected in six observations using line transects and plots measuring 10 x 10 m. Mangrove diversity was analyzed using the Shannon-Weaver and Simpson indexes, and variations in mangrove community the structure was analyzed using clusters, non-metric MDS, ANOSIM, and SIMPER. The study discovered 12 mangrove species in North Rupat District, Bengkalis Regency, Riau Province, which was classified into 6 families based on diversity analysis (H') Shannon Weaver indexes ranging from 01.34 to 01.72 and Simpson indexes ranging from 02.43 to 02.81. Furthermore, the results of the mangrove diversity analysis using multivariate clusters and non-metric MDS were divided into four groups, and while the cluster analysis based on the value of the mangrove density had a similarity of 60%, the variation in the significance of mangrove density was significantly different (R = 0.689, p = 0.000), and the mangrove species that compose varies between stations. Moreover, the trunk diameter of mangrove vegetation in North Rupat District, Bengkalis Regency, Riau Province is dominated by mangrove stands with a trunk diameter of 01.00 - 20.00 cm, with the mangrove vegetation that grows and develops at Stations 2 and 6 being relatively younger than the other stations. Stations 3 and 4 are considered more mature in terms of growth and development.  Peningkatan aktivitas manusia di segala setor kehidupan telah mendorong penurunan hutan mangrove, sehingga kajian analisis multivariat pada struktur komunitas mangrove di Kecamatan Rupat Utara Kabupaten Bengkalis Provinsi Riau telah dilakukan pada bulan Juli 2018 dengan tujuan untuk mengestimasi atau menilai kondisi struktur komunitas mangrovenya. Data kondisi vegetasi mangrove dikumpulkan pada enam stasiun pengamatan dengan membuat transek garis dan plot yang berukuran 10 x 10 m, kemudian keanekaragaman mangrovenya dianalisis menggunakan indeks Shannon-Weaver dan Simpson, sedangkan variasi struktur komunitas mangrovenya dianalisis berdasarkan cluster, non-metric MDS, ANOSIM dan SIMPER. Hasil kajian menemukan 12 spesies mangrove di Kecamatan Rupat Utara Kabupaten Bengkalis Provinsi Riau yang tergolong ke dalam 6 famili dengan analisis keanekaragaman (H’) indeks Shannon Weaver berkisar antara 01.34 – 01.72 dan indeks Simpson berkisar antara 02.43–02.81, kemudian hasil analisis keanekaragaman mangrovenya dengan multivariat cluster dan non-metric MDS terbagi atas empat kelompok, sedangkan analisis cluster berdasarkan nilai kerapatan mangrovenya memiliki kemiripan ± 60%, variasi signifikansi kerapatan mangrovenya berbeda nyata (R = 0.689, p = 0.000) serta spesies mangrove penyusun antar stasiun pengamatannya bervariasi. Selain itu, diameter batang vegetasi mangrove di Kecamatan Rupat Utara Kabupaten Bengkalis Provinsi Riau didominasi oleh tegakan mangrove berdiameter batang 01.00 – 20.00 cm, dimana vegetasi mangrove yang tumbuh dan berkembang di Stasiun 2 maupun 6 tergolong lebih muda dibandingkan stasiun yang lainnya, sedangkan vegetasi mangrove yang tumbuh dan berkembang di Stasiun 3 maupun 4 tergolong lebih matang.
      PubDate: 2023-06-06
      DOI: 10.14710/jkt.v26i2.15622
      Issue No: Vol. 26, No. 2 (2023)
       
  • Carrageenan Extraction of Kappaphycus alvarezii Seaweed from Nusa
           Lembongan Waters Using Different Alkaline Treatments

    • Authors: Ichoun Brawici Dhewang, Ervia Yudiati, Subagiyo Subagiyo, Rabia Alghazeer
      Pages: 238 - 244
      Abstract: Kappaphycus alvarezii is a carrageenan-producing red seaweed that is widely cultivated in Nusa Lembongan waters, Bali, Indonesia. Carrageenan is generally extracted using an alkaline base,. iIn this study three different types of alkali were used to extract carrageenan originating from Nusa Lembongan Waters. This study aims to determine the quality of the extraction. The three alkalis used were KOH, NaOH, Ca(OH)2, and distilled water as a control. The 20 g dried seaweed was weighed, washed with the tap running water, and immersed in 0.15% alkaline solution (KOH, NaOH, Ca(OH)2) as well as distilled water for 24 hrs. Followed by rinsing with running water until pH was neutral. The solution was soaked and heated at 100ºC for 2 hours with a ratio of seaweed and water 1 kg in 20 L, and filtered. The extract was mixed with 1.25% KCI. The carrageenan precipitate was put in the oven at 60-80ºC until dry for 48 hours. The yield test results showed that the use of alkaline Ca(OH)2 resulted in a yield of 29.28% better than alkaline KOH (28.18%) and NaOH (27.7%). Based on the analysis of Fourier Transform Infrared Spectroscopy (FTIR), extraction using alkaline Ca(OH)2 showed functional groups characteristic of iota-carrageenan, whereas using alkaline KOH and NaOH showed functional groups characteristic of kappa-carrageenan.
      PubDate: 2023-06-06
      DOI: 10.14710/jkt.v26i2.17389
      Issue No: Vol. 26, No. 2 (2023)
       
  • Bioconcentration of Chromium (Cr) on The Soft Tissue of Mussels (Perna
           viridis, Linnaeus 1758) in Tambak Lorok Waters, Semarang

    • Authors: Siti Rudiyanti, Suryanti Suryanti, Churun Ain
      Pages: 245 - 254
      Abstract: Industrial development provides economic benefits, but also increases the concentration of waste pollution which affects the aquatic environment of Tambak Lorok on the North Coast of Central Java. The existence of this waste will affect the life of the biota in it, such as mussels (Perna viridis). The heavy metal Chromium is the focus of research, considering that its presence in large quantities which accumulates in the human body causes health problems. The aims of the research were to determine the content of heavy metal Cr in the waters, sediments, and soft tissue of mussels, to determine the bioconcentration of heavy metal Cr in mussels, and to determine the tolerable intake of weekly consumption of the mussels cultivated in Tambak Lorok waters. The content of Cr in water samples, sediment, and mussel soft tissue was measured the APHA 3111B-2012 method, US EPA SW-846/3050 B-1996 SM 3111B-2012 method, and SSA method. The calculation of bioconcentration mussels, using the bioconcentration factor and Maximum Tolerable Intake. The heavy metal content of Cr in the water column was 0.015 – 0.025 mg.L-1 (upper the quality standard), in sediment was 25.12 – 28.72 mg.kg-1(lower the quality standard), and in the soft tissue of mussels was 0.155 – 0.265 mg/kg (upper the quality standard). The bioconcentration factor of metal Cr in mussels is classified as low, which is around 10.35 – 14. The maximum tolerable intake for mussels was 6,078 kg/week, it is considered safe for consumption.
      PubDate: 2023-06-06
      DOI: 10.14710/jkt.v26i2.17563
      Issue No: Vol. 26, No. 2 (2023)
       
  • Immune Profile of Litopenaeus vannamei in Monoculture and IMTA Ponds
           System

    • Authors: Chrisna Adhi Suryono, Ervia Yudiati, Nuril Azhar
      Pages: 255 - 262
      Abstract: Integrated Multi Trophic Level (IMTA) is identified as the integrating culture of multi-species in one area. The effectiveness of space and feed is the main aspect from this point. The disease and health of shrimp management on shrimp production including immune boosters plays a critical aspect. The aim of this research is to determine and analyze the Litopenaeus vannamei immune system in different culture systems, namely polyculture (IMTA) and monoculture. Alginate was applied as supplementation diet by oral administration. The cellular and humoral immune parameters ie. Total hemolymph Count (THC), Phagocyte Activity (PA), Phagocyte Index (PI), Phenoloxidase activity (PO), and Superoxide dismutase activity (SOD) were assessed, monthly. A completely randomized design (CRD) with two treatments (IMTA and monoculture, and four replications in 500 m2 pond area was conducted. In the third month, THC and PA of shrimp from the monoculture pond resulted in significant differences (p<0.05) compared to polyculture (IMTA). SOD activity from monoculture is significantly higher (p<0.05) at every sampling period. In PO enzyme activity of shrimps from monoculture pond produced higher results compared to IMTA ponds in the 2nd and 3rd months. It is concluded that L. vannamei monoculture ponds produced higher immune parameters compared to IMTA ponds. The food competition in terms of feed and space from IMTA ponds may affect this fact. Improving the feeding technique is recommended.
      PubDate: 2023-06-06
      DOI: 10.14710/jkt.v26i2.18428
      Issue No: Vol. 26, No. 2 (2023)
       
  • Biologi Reproduksi Lalosi Merah (Pterocaeasio tile, Cuvier 1830)
           Hubungannya Dengan Selektivitas Jaring Insang Lingkar

    • Authors: Haruna Haruna, Agustinus Tupamahu, Reskyta Maharani Aprillia
      Pages: 263 - 271
      Abstract: Intensive and massive fishing exploitation of various reef fish resources occurs in coastal areas, including the Pteriocaesio tile (dark-banded fusilier). This study was conducted due to a lack of information, including size distribution, length of first captured (Lc), length at first mature (Lm), and the selectivity of the mesh size for Pteriocaesio tile caught in the Huamual Belakang waters. The data collection was conducted from September to December 2022. The experimental fishing method was conducted by operating one unit of encircling gillnet consisting of eight panels, each consisting of four mesh net units of 1.75 inch and 2.0 inch, installed randomly. Samples of fish caught for each actual fishing were measured for total length. The reproductive aspect used 10-15% of fish samples per trip. The fish were measured for total length and body weight, and dissected to determine the sex and gonad maturity level and weight. The catches with encircling gillnets were dominated by the Caesionidae family, consisting of Pteriocaesio tile at 74.73%, Pterocaesio chrysozona at 6.80%, and caesio caerulaurea at 6.41%. The size distribution of the total length of Pteriocaesio tile was 15.0 – 27.3 cm. The average length first caught in a  1.75-inch mesh was 21.4 cm, and 22.5 cm for the 2.0-inch mesh. The length at first mature was 18.6 cm for the female, and 20.6 cm for the male. The gillnet selectivity obtained 50% chance of being caught in the mesh size of 1.75 inches was 18.8 cm, and 21.9 cm in the mesh size of 2.0 inches. The status of the resource utilization of Pteriocaesio tile was in good condition (Lc > Lm). Nevertheless, the use of the 1.75-inch mesh size indicated recruitment overfishing   Eksploitasi penangkapan terjadi secara intensif dan masif di wilayah pesisir terhadap berbagai sumberdaya ikan karang termasuk ikan Pteriocaesio tile (dark-banded fusilier). Penelitian ini dilakukan karena masih minimnya informasi meliputi; distribusi ukuran, ukuran ikan pertama kali tertangkap, ukuran ikan pertama kali matang gonad, dan selektivitas ukuran mata jaring Pteriocaesio tile yang tertangkap di perairan Huamual Belakang. Pengumpulan data dilakukan pada bulan September sampai Desember 2022. Metode experimental fishing dilakukan dengan mengoperasikan satu unit jaring insang lingkar terdiri dari 8 panel ukuran mata jaring 1,75 inci dan 2,0 inci yang dipasang secara acak. Sampel ikan hasil tangkapan setiap aktual atau trip penangkapan diukur panjang total, untuk aspek reproduksi menggunakan 10-15% sampel ikan setiap trip, ikan diukur panjang total, berat tubuh dan dibedah untuk mengetahui jenis kelamin, tingkat kematangan gonad maupun berat gonad.  Hasil tangkapan jaring insang lingkar di dominasi family Caesionidae masing-masing jenis ikan Pteriocaesio tile 74,73%, Pterocaesio chrysozona 6,80% dan Caesio caerulaurea 6,41%. Distribusi ukuran panjang total ikan Pteriocaesio tile 15,0-27,3 cm. Ukuran ikan rata-rata pertama kali tertangkap mata jaring 1,75 inci adalah  21,4 cm dan 2,0 inci adalah 22,5 cm. Ukuran pertama kali matang gonad ikan betina 18,6 cm dan jantan  20,6 cm. Selektivitas jaring diperoleh peluang tertangkap 50% mata jaring 1,75 inci adalah 18,8 cm dan 2,0 inci adalah 21,9 cm. Status pemanfaatan sumberdaya ikan P tile berada dalam kondisi baik (Lc > Lm) tetapi penggunaan mata jaring 1,75 inci terindikasi mengalami recruitment overfishing.
      PubDate: 2023-06-07
      DOI: 10.14710/jkt.v26i2.17457
      Issue No: Vol. 26, No. 2 (2023)
       
  • Effect of Vitamin C Bioencapsulation in Natural Feed on Protein, Fat,
           Energy, and Mortality of Milkfish Larvae (Chanos chanos)

    • Authors: Sri Mulyani, Sutia Budi, Indra Cahyono, Khairiman Khairiman
      Pages: 272 - 282
      Abstract: Indications of milkfish larvae problems show lack symptoms of vitamin C in the tissues, which will cause defective bone formation and become an inhibitor factor in growth and mortality. This research aims to investigate the influence of vitamin C bioencapsulation on rotifer and artemia in protein retention, fat, energy, and the cause of death in milkfish larvae (Chanos chanos). The dose of vitamin C used in this study were 0 (control), 50, 100, 150, and 200 mg L-1. The treatment starts from D-1 to D-30 stadia of milkfish larvae, with 30-day maintenance. The density of milkfish larvae utilized is 20 L-1. The protein and fat content of milkfish larvae bodies were measured using a proximate analysis, and the energy content of the feed was measured using a bomb calorimeter. Mortality was observed under the Ministry of Health of Republic Indonesia standard binocular microscope by identifying larvae that died daily in each container. This research shows that vitamin C bioencapsulation in rotifer and artemia affects the retention rate of protein, fat, energy and the cause of milkfish larvae mortality. The dose of vitamin C of 150 and 200 mg L-1 is effective in improving protein, fat, and energy retention, which can minimize the cause of milkfish larvae mortality. The best results are obtained by bioencapsulating Vitamin C on rotifer and artemia with dose of 150 mg L-1.
      PubDate: 2023-06-07
      DOI: 10.14710/jkt.v26i2.17969
      Issue No: Vol. 26, No. 2 (2023)
       
  • Vegetation Analysis as Indicator of Mangrove Degradation Level in Keboromo
           Village, Tayu

    • Authors: M. Amanun Tharieq, Azis Nur Bambang, Lita Tyesta Addy Listya Wardhani, Sri Redjeki, Rudhi Pribadi
      Pages: 283 - 292
      Abstract: Mangrove degradation is one of the most common issues in the coastal areas of Java, which can cause ecological impacts and even disadvantage for local community. The mangrove forest degradation can be identified based on the vegetation analysis results, which could potentially contribute to the mangrove ecosystem management and rehabilitation programs in the coastal areas. Mangroves in Keboromo Village was the rehabilitation and cultivation area, but often get damaged by ocean waves. This study aims to determine the ecological and vegetation conditions of mangrove ecosystems consist of species composition, density, canopy cover, tree height, and environmental parameters were held in February 2023. The method used was direct observation using transect quadrants of 10x10 m2. The average mangrove density of all observation stations was 3.425 individuals/ha for the tree category, 575 individuals/ha for the sapling category, and 250 individuals/ha for the seedling category. The average percentage of canopy cover was 78.41%. The average height of mangrove trees at all stations is 4.15 m. The environmental parameters were still compatible with the water quality standard for biota and mangrove life. The mangrove forest degradation level based on standard criteria and guidelines for determining mangrove degradation is categorized as low, indicated by mangrove density >1500 individuals/ha and canopy cover >75%. Poor conditions were measured for sapling and seedling densities, which may be caused by environmental factors unsupportive for mangrove regeneration. Based on the results of mangrove vegetation analysis in Keboromo Village, it can state the mangrove ecosystem condition is good. However, management programs are needed to keep the mangroves sustainable.
      PubDate: 2023-06-07
      DOI: 10.14710/jkt.v26i2.17575
      Issue No: Vol. 26, No. 2 (2023)
       
  • Kebiasaan Makanan Beberapa Jenis Ikan di Ekosistem Mangrove Lubuk Kertang,
           Sumatera Utara

    • Authors: Ananingtyas S Darmarini, Desrita Desrita, Onrizal Onrizal
      Pages: 293 - 300
      Abstract: Mangrove ecosystems are very important for coastal waters, one of which is as a provider of food sources for biota in the surrounding waters. This study aims to determine the food habits of several types of fish found in the waters around the Lubuk Kertang mangrove ecosystem, Langkat, North Sumatra. The research location is a mangrove restoration area with the main species Rhizopora apiculata. The research was conducted in January 2021. The collection of fish samples was carried out using gill net with 1.5 inchi which is commonly used by fishermen. Sampling was carried out by spreading the net three times. The tested fish samples consisted of 46 individuals with 12 species, 9 families, and 6 orders. The highest number of fish caught was Clupeiformes with a percentage of 41.67%, while the order found with a low percentage was Beloniformes (2%). The families found in large numbers were Mugillidae, the families found in low numbers were Lutjanidae and Serranidae. The species caught the most is Chelon subviridis. Stomach contents analysis was performed with the Index of Preponderance (IP). Based on the type of food found in the stomach contents of the test fish, there were various types of food consisting of 11 types, namely phytoplankton, zooplankton, squid, fish (juvenile fish), crabs, shrimp, shellfish, litter, moss, pieces of insect bodies, and plant parts. The types of food that the plant fragments are found in are 9 fish species, phytoplankton (7 species), shrimp (7 species), and litter (5 species).  Ekosistem mangrove sangat penting bagi perairan salah satunya adalah sebagai penyedia sumber makanan biota pada perairan di sekitarnya. Penelitian ini bertujuan untuk mengetahui kebiasaan makanan beberapa jenis ikan yang ditemukan di perairan sekitar ekosistem mangrove Lubuk Kertang, Langkat, Sumatera Utara. Lokasi penelitian merupakan merupakan wilayah restorasi mangrove dengan vegetasi utama Rhizopora apiculata. Penelitian dilakukan pada bulan Januari 2021. Pengumpulan sampel ikan dilakukan dengan menggunakan jaring gill net dengan ukuran 1.5 inchi yang biasa digunakan oleh nelayan. Sampling dilakukan dengan melakukan tiga kali tebar jaring. Sampel ikan uji terdiri dari 46 individu dengan 12 spesies, 9 famili, dan 6 ordo. Jumlah ikan terbanyak yang tertangkap adalah Clupeiformes dengan persentase sebesar 41.67%, sedangkan ordo yang ditemukan dengan persentase yang rendah adalah Beloniformes (2%). Famili yang ditemukan dalam jumlah besar adalah Mugillidae, famili yang ditemukan dengan jumlah rendah adalah Lutjanidae dan Serranidae. Spesies yang paling banyak tertangkap adalah jenis Chelon subviridis. Analisis isi perut dilakukan dengan Indeks of Preponderance (IP). Berdasarkan jenis makanan yang ditemukan pada isi perut ikan uji, terdapat berbagai jenis makanan yang terdiri dari 11 jenis yaitu fitoplankton, zooplankton, cumi-cumi, ikan (juvenil ikan), kepiting, udang, cangkang kerang, serasah, lumut, potongan tubuh serangga, dan potongan tubuh tumbuhan. Jenis makanan potongan tumbuhan terdapat pada 9 spesies ikan, fitoplankton (7 spesies), udang (7 spesies) dan serasah (5 spesies). 
      PubDate: 2023-06-07
      DOI: 10.14710/jkt.v26i2.16143
      Issue No: Vol. 26, No. 2 (2023)
       
  • Effect of different diets on growth performance, physiological response
           and behavior of spiny lobster Panulirus homarus (Linnaeus, 1758)

    • Authors: Arief Rahman Rivaie, Yudha Trinoegraha Adiputra, Agus Setyawan, Dwi Handoko Putro
      Pages: 301 - 314
      Abstract: This study aimed to know the effect of different feedings on growth performance, physiological responses, and behavioral changes of juvenile spiny lobsters. The experimental method used a completely randomized design with three treatments and four replications. There were three different feeds used as treatment, namely: flesh mussel (K), commercial fish feed (I), and commercial shrimp feed (U). Feed is given as much as 30% of body weight, five times per day at 6:30 am, 12:00 pm, 4:00 pm, 9:00 pm, and 2:00 am. The results showed that the commercial feeding of fish (I) significantly (P<0.05) increased the survival rate and biomass of spiny lobster for 54.17% and 141.7 g, respectively. While fresh mussel give better growth and stress response, but had the lowest survival rate. The results of the physiological response test of lobster were more effective in suppressing lobster stress levels than other treatments (P<0.05). The behavior of juvenile spiny lobsters showed a very striking color difference and reflex impairment scores, which indicated that the vitality of the treated juveniles (I) was better than the vitality of the treatments (K) and treatment (U). This study shows that commercial fish feed (I) is recommended for maintaining spiny lobsters in the juvenile phase, although it needs further maintenance by using an appropriate feed formulation to improve the growth performance of spiny lobsters.
      PubDate: 2023-06-07
      DOI: 10.14710/jkt.v26i2.17656
      Issue No: Vol. 26, No. 2 (2023)
       
  • Growth Performance of Scalloped Spiny Lobster (Panulirus homarus) Given
           Artificial Feed Based on Chicken Eggs Hatching Waste

    • Authors: Natasya Cahya Okta, Fariq Azhar, Andre Rachmat Scabra, Abdul Syukur, Muhammad Amin, Faturrahman Faturrahman
      Pages: 315 - 328
      Abstract: The availability of cheap and high nutritional value artificial feed is a prerequisite for the sustainability of lobster cultivation. In this study, the lobster feed formula was made based on chicken egg hatching waste and maggot flour. The purpose of this study was to determine the performance of scalloped spiny lobsters with artificial feed treatment P1 (70% fish meal + 0% hatching waste), P2 treatment (50% fishmeal + 20% hatching waste), P3 treatment (30% fishmeal + 40% hatching waste), and P4 treatment (10% fishmeal + 60% hatchery waste). This study used lobster seedlings with a size of 1.5 - 3.5 cm which were kept for 60 days. Lobster performance is measured based on body weight, body length, growth rate, feed conversion, molting and lobster dilution rate. The data were analyzed descriptively by presenting mean, standard deviation, and statistical analysis using Duncan's advanced test. The results of the lobster performance study based on absolute length and weight in the P1 treatment were obtained 1.22±0.05 and 1.03±0.21; on P2 treatment obtained 1.31±0.16 and 1.16±0.09; P3 treatment obtained 1.37±0.37 and 1.47±0.13; and P4 treatment obtained 0.82±0.18 and 0.9±0.22. The calculation of the specific growth rate in the P1 treatment was obtained 0.56±0.09, the P2 treatment was obtained 0.69±0.21, the P3 treatment was obtained 0.73±0.16, and the P4 treatment was obtained 0.56±0.24. The ratio of feed conversion and lobster dilution shows a tendency to decrease as the concentration of chicken hatching waste increases. The growth performance of scalloped spiny lobsters fed with chicken egg hatching waste-based feed is quite good up to a concentration of 40% and if more than that will reduce the growth performance of lobsters. 
      PubDate: 2023-06-07
      DOI: 10.14710/jkt.v26i2.17609
      Issue No: Vol. 26, No. 2 (2023)
       
  • Identification of Sea Level Rise and Land Subsidence Based on Sentinel 1
           Data in the Coastal City of Pekalongan, Central Java, Indonesia

    • Authors: Lessy Andari, Denny Nugroho Sugianto, Anindya Wirasatriya, Satria Ginanjar
      Pages: 329 - 339
      Abstract: Sea level rise is a pure impact of climate change. However, the process of studying sea level rise must include local factors that influence such as land subsidence. This study focuses on sea level rise using the CEEMDAN method and land subsidence using the DInSAR method. The location of this research is Pekalongan, Central Java, Indonesia. Tidal data used in this study was for five years, from 2016 to 2020, obtained from the Geospatial Information Agency (BIG). Then the data used to study land subsidence in this study uses Sentinel-1 Synthetic Aperture Radar (SAR) data in 2015, 2016, 2017, and 2020. Pekalongan is an area with mixed diurnal tidal types with Formzahl number 1.7. The sea level rise in Pekalongan is relatively high, at 10.6 mm/year. Then the land subsidence that occurred in Pekalongan is the phenomenon that has the most influence on the occurrence of coastal flooding in the region. The average land subsidence on the coast of Pekalongan is 5.37 cm/year. In addition, the sampling results in 6 areas showed that the most significant decrease was in Area 2, with a decrease of -7.91 cm/year. Based on this research, land subsidence is the most considerable influence on flooding in Pekalongan compared to sea level rise.
      PubDate: 2023-06-08
      DOI: 10.14710/jkt.v26i2.18324
      Issue No: Vol. 26, No. 2 (2023)
       
  • Distribution and Growth Patterns of Crab (P. pelagicus) Based on
           Environmental Characteristics in Candi Waters, Pamekasan Regency, East
           Java Province

    • Authors: Leni Maryani, Dietriech Geoffrey Bengen, I Wayan Nurjaya
      Pages: 340 - 348
      Abstract: Blue swimming crab (BSC) is a fishery commodity with high economic value and great demand in domestic and foreign markets. P. pelagicus swimming crabs are commonly found in Indonesian sea waters, one of the largest contributors to the country's foreign exchange after shrimp and tuna. The high demand for blue crab resources will trigger an increase in fishing efforts. If this is done continuously, it is feared that it could endanger the population structure. Moreover, disrupting the sustainability of blue swimming crab resources in the waters, this study examines the morphometric distribution and growth pattern of P. pelagicus crabs based on environmental characteristics in Candi waters, Pamekasaan Regency. Census sampling was carried out using the census method; the census method was carried out by taking all crab samples caught by fishermen. The results obtained found 33 individual crabs, which were divided into three classes, namely small (<10 cm), medium (>10 cm), and large (>12 cm) size classes. Male crabs dominated the research locations with wider straps than female crabs. The analysis results show that the width-weight relationship's b values are 1.47 (males) and 2.00 (females). In addition, male and female crabs have a positive allometric growth pattern. Blue swimming crabs are often found in habitats with a substrate of dusty mud, high salinity and organic matter.
      PubDate: 2023-06-08
      DOI: 10.14710/jkt.v26i2.17322
      Issue No: Vol. 26, No. 2 (2023)
       
  • Sebaran Material Padatan Tersuspensi Berdasarkan Data Citra Sentinel-2 di
           Perairan Tanjung Jati, Jepara

    • Authors: Dhany Aji Perwata, Elis Indrayanti, Baskoro Rochaddi
      Pages: 349 - 356
      Abstract: Tanjung Jati waters are located around the Tanjung Jati Coal Fired Power Plant, Jepara. Burning coal as a fuel for power plant produces fly and bottom ash, which can affect the concentration of total suspended solid (TSS). This study aims to determine the distribution of TSS based on Sentinel-2 level 2A imagery data of Tanjung Jati waters, Jepara. TSS data from field survey, TSS, and Reflectance Remote Sensing (RRS) data from the Copernicus Sentinel site on 25 October 2021 with a resolution of 10 m were used in this study. Processing data using the algorithm of Lemigas, Budhiman, Parwati, Laili, and developing a new algorithm with a regression function method to estimate TSS concentration. The distribution pattern of TSS in Tanjung Jati Waters, Jepara has a high concentration in areas near land and decreases towards the open sea. The Root Mean Square Error (RMSE) value is 2.704 mg/l, it can be concluded that the proposed algorithm is suitable for describing the distribution of TSS concentrations in Tanjung Jati waters, Jepara. Observation of the distribution of TSS can be used for further analysis to determine sedimentation patterns and water quality.  Perairan Tanjung Jati merupakan perairan yang berada di sekitar area PLTU Tanjung Jati, Jepara. Batu bara sebagai bahan bakar untuk kebutuhan PLTU menghasilkan fly dan bottom ash yang dapat mempengaruhi konsentrasi material padatan tersuspensi (MPT) di perairan sekitarnya. Penelitian ini bertujuan untuk mengetahui sebaran MPT di Perairan Tanjung Jati, Jepara berdasarkan data citra Sentinel-2 Level 2A. Data yang digunakan dalam penelitian meliputi data MPT hasil pengukuran lapangan, data MPT dan Reflectance Remote Sensing (RRS) dari situs sentinel copernicus tanggal 25 Oktober 2021, dengan resolusi 10 m. Pengolahan data menggunakan algoritma Lemigas, Budhiman, Parwati, Laili, dan pengembangan algoritma baru dengan metode regresi. Hasil penelitian menunjukkan bahwa pola sebaran MPT di Perairan Tanjung Jati, Jepara memiliki konsentrasi tinggi pada daerah dekat daratan dan semakin berkurang menuju laut lepas. Nilai RMSE sebesar 2,704 mg/l, hal ini menunjukkan bahwa formula algoritma usulan yang diperoleh sesuai untuk menggambarkan sebaran konsentrasi MPT di perairan Tanjung Jati, Jepara. Hasil sebaran MPT ini dapat digunakan dalam analisa lebih lanjut untuk mengetahui pola sedimentasi dan penilaian kualitas air.
      PubDate: 2023-06-08
      DOI: 10.14710/jkt.v26i2.18468
      Issue No: Vol. 26, No. 2 (2023)
       
  • Kepiting Genera Scylla di Pesisir Kota Langsa: Distribusi, Dimensi
           Tangkapan Alami dan Analisis Bioekonominya

    • Authors: Muhammad Jamil, Andika Putriningtias, Silvia Anzhita, Helmy Akbar, Syahrial Syahrial, Hanisah Hanisah, Teuku Muhammad Faisal, Sorbakti Sinaga
      Pages: 357 - 368
      Abstract: A study of the Scylla genera of crabs was conducted in May in five villages in Langsa City to know their distribution, dimensions of natural catch, and bioeconomic analysis. The method used was the accidental sampling of 30 respondents. Then the information was collected on the demographics and characteristics of the respondents as well as the distribution and dimensions of the Scylla genera crab catch. Respondents indicated that the Scylla genera crabs were distributed in 12 villages, namely Cinta Raja Village, Sungai Lueng, Alue Pineung Timue, Kapa, Lhok Banie, Simpang Lhee, Seuriget, Matang Seulimeng, Sungai Pauh, Kuala Langsa, Sungai Pauh Pusaka, Sungai Pauh Firdaus, and Sungai Pauh Tanjong. The highest catch composition was 4 kg/trip (40%) and the sizes of crabs were all sizes (100%). Furthermore, the dominant duration of the profession of crab catcher is 4 – 6 years (37%) with the predominant age of a crab catcher being 30 – 44 years (53%). The results of the bioeconomic analysis show that the Scylla crab fisheries in Langsa City are still profitable because any increase in catch costs does not reduce total income at all.   Kajian kepiting genera Scylla dilakukan pada bulan Mei di 5 desa Kota Langsa dengan tujuan untuk mengetahui distribusi, dimensi tangkapan alami dan analisis bioekonominya. Metode yang digunakan adalah accidental sampling pada 30 responden, kemudian informasi yang dikumpulkan mengenai demografi dan karakteristik responden serta distribusi dan dimensi penangkapan kepiting genera Scylla. Responden menunjukkan bahwa kepiting genera Scylla terdistribusi di 12 desa yaitu Desa Cinta Raja, Sungai Lueng, Alue Pineung Timue, Kapa, Lhok Banie, Simpang Lhee, Seuriget, Matang Seulimeng, Sungai Pauh, Kuala Langsa, Sungai Pauh Pusaka, Sungai Pauh Firdaus dan Sungai Pauh Tanjong dengan komposisi tangkapan tertingginya adalah 4 kg/trip (40%) dan ukuran kepiting genera Scylla yang diambil adalah semua ukuran (100%). Selanjutnya lamanya profesi sebagai penangkap kepiting yang telah dijalani dominannya adalah 4 – 6 tahun (37%) dengan usia penangkap kepiting dominannya adalah 30 – 44 tahun (53%). Sementara hasil analisis bioekonomi memperlihatkan bahwa kondisi perikanan tangkap kepiting genera Scylla di Kota Langsa masih menguntungkan karena setiap kenaikan biaya tangkapan sama sekali tidak menurunkan total pendapatan.
      PubDate: 2023-06-12
      DOI: 10.14710/jkt.v26i2.17780
      Issue No: Vol. 26, No. 2 (2023)
       
  • Kandungan Klorofil-a dan Karotenoid Pada Eucheuma cottoni yang
           Dibudidayakan Kedalaman Berbeda di Teluk Cina Pulau Lemukutan

    • Authors: Sukal Minsas, Aldhea Rachma Nanda, Syarif Irwan Nurdiansyah, Nora Idiawati, Sepridawati Siregar
      Pages: 369 - 376
      Abstract: Seaweed is one of the low-level plant species in the algae group that lives in water which carries out the process of photosynthesis and requires light. The purpose of this study was to see the content of chlorophyll-a and carotenoids at different depths and to determine the correlation between the content of chlorophyll-a and carotenoids with their physical and chemical parameters. This research was conducted in the waters of the Chinese Bay of Lemukutan Island. The method used in this cultivation is floating cages. The benefit of this research is to determine the optimal content of chlorophyll-a and carotenoids, as well as to provide information that can be studied in the Health and Pharmaceutical Sections. Seaweed cultivation is carried out for 50 days from February to April 2022 on Lemukutan Island. Eucheuma cottoni seaweed was cultivated at a depth of 30 cm, 60 cm and 90 cm. Measurement of chlorophyll-a and carotenoid content was carried out in the laboratory using a spectrophotometer and analyzed using ANOVA on SPSS. This study found that the chlorophyll-a content at a depth of 30 cm was 2.209 mg/g, at a depth of 60 cm was 1.706 mg/g, and at a depth of 90 cm was 1.970 mg/g. As for the carotenoid content, at a depth of 30 cm, it was 0.281 mg/g, at a depth of 60 cm, it was 0.275 mg/g and at a depth of 90 cm, it was 0.337 mg/g.  Rumput laut merupakan salah satu jenis tumbuhan tingkat rendah pada golongan alga yang hidup di air yang melakukan proses fotosintesis dan memerlukan cahaya. Tujuan dari penelitian ini adalah untuk melihat kandungan klorofil-a dan karotenoid terhadap kedalaman yang berbeda dan mengetahui korelasi antara kandungan klorofil-a dan karotenoid dengan parameter fisika dan kimianya. Penelitian ini dilakukan di perairan Teluk Cina Pulau Lemukutan. Metode yang dipakai dalam budidaya ini yaitu keramba apung. Manfaat dari penelitian ini adalah untuk mengetahui kandungan klorofil-a dan karotenoid yang optimal, serta memberikan informasi yang dapat dikaji dibagian Kesehatan dan farmasi.  Budidaya rumput laut ini dilakukan selama 50 hari dari bulan Februari-April 2022 di Pulau Lemukutan. Rumput laut Eucheuma cottoni dibudidayakan pada kedalaman 30 cm, 60 cm, dan 90 cm. Pengukuran kandungan klorofil-a dan karotenoid dilakukan di laboratorium menggunakan alat spektofotometri dan dianalisis menggunakan ANOVA pada SPSS. Penelitian ini mendapatkan kandungan klorofi-a pada kedalaman 30 cm yaitu 2,209 mg/g, kedalaman 60 cm yaitu 1,706 mg/g, dan kedalaman 90 cm yaitu 1,970 mg/g. Sedangkan untuk kadungan karotenoid yaitu pada kedalaman 30 cm yaitu 0,281 mg/g, kedalaman 60 cm yaitu 0,275 mg/g dan kedalaman 90 cm 0,337 mg/g.
      PubDate: 2023-06-12
      DOI: 10.14710/jkt.v26i2.15950
      Issue No: Vol. 26, No. 2 (2023)
       
  • The Composition of Portunus pelagicus on the Fishing Ground Area of
           Danasari Waters, Pemalang Regency

    • Authors: Sri Redjeki, Ria Azizah Tri Nuraini, Hadi Endrawati
      Pages: 377 - 386
      Abstract: Blue swimming crab (Portunus pelagicus) is one of the most economically valuable marine products in Indonesia. The crabs productivity was generally still dependent on the population in the wild. Danasari Village is one of the main crab producers in Pemalang Regency. The daily fishing crab activities by fisherman direct an impact on decreasing of the natural crabs resources. This study determined the crabs composition in the fishing ground where usually spotted by the Danasari crab fisherman. This research obtained the information of a composition of female and male crabs, carapace width distribution, growth characterized, and the egg-berried female number. This study conducted on May to July 2022. The result in this research was a male crabs were dominated than females. The carapace width was generally amount 92-112 mm, while the growth characteristic of blue swimming crabs was negative allometric. The female crab gonad maturity was dominated by 2nd level gonad maturity, while the egg-berried female crabs were found 21 crabs totaled from 14 spot fishing grounds. Based on the carapace width distribution, there are a lot of blue swimming crab with undersized in shallow-depth fishing sites, while the crab size mostly above 100 mm already found at each spot in this research. The highest egg-berried female percentage was found at spot 7th and 13rd, where the female crabs at 7th spot were bigger carapace than at 13rd spot areas. These results indicated that crab resources in Danasari Waters and surround area were indicated potentially overfished, proven with undersized berried-female crabs. The management efforts will conduct an environmentally friendly fishing gear, regarding the policy of ministry regulating as to keep crab resources sustainable. In addition, scheduling rules for fishing activities can also be tested to be applied.
      PubDate: 2023-06-14
      DOI: 10.14710/jkt.v26i2.18825
      Issue No: Vol. 26, No. 2 (2023)
       
  • Estimasi Stok Karbon Padang Lamun menggunakan Citra Spot-7 di Perairan
           Pulau Kodingarenglompo, Sangkarrang, Kota Makassar

    • Authors: Muh Rais, Dwi Fajriyati Inaku, Wilma J.C. Moka, Supriadi Mashoreng, Dewi Yanuarita Satari, Nita Rukminasari
      Pages: 387 - 398
      Abstract: Seagrass is the most effective ecosystem in absorbing carbon. The ability of seagrasses to absorb CO2 from the atmosphere is better than terrestrial ecosystems. Image processing methods and information regarding potential carbon stocks in seagrass beds can then be used as a basis for managing carbon stocks found in coastal areas and small islands. This study aims to estimate the carbon stock of seagrass beds in the waters of Kodingarenglompo Island using remote sensing technology. This research was conducted from March to August 2020. The stages of the field survey were to identify the percentage of seagrass cover in 62 plot points. Seagrass carbon stocks are known based on seagrass cover percentage data using the regression equation. The estimation of seagrass carbon stocks in the study area is divided into two, namely AGC and BGC. The image processing stage is by using the random forest regression algorithm in mapping seagrass carbon stocks. The results of this research survey revealed six species of seagrass, namely Cymodocea rotundata, Enhalus acoroides, Halodule uninervis, Halophila ovalis, Thalassia hemprichii and Syringodium isoetifolium and were dominated by 2 species of seagrass, namely Thalassia hemprichii and Enhalus acoroides. The results showed that remote sensing can be used to map seagrass carbon stocks. Seagrass carbon stocks can be mapped with a maximum accuracy of 67% (SE=1.96 KgC/Pixel), and 85% (SE=7.86 KgC/Pixel) for AGC and BGC. From this model, the total ecosystem carbon stock in seagrasses in the waters of Kodingarenglompo Island is estimated to be around 178.98 tons of organic carbon with an area of seagrass beds of 81.29 hectares. The availability of seagrass carbon stock maps is very important to provide a better understanding of the spatial and temporal distribution of carbon dynamics.  Lamun adalah ekosistem yang paling efektif dalam menyerap karbon. Kemampuan lamun untuk menyerap CO2 dari atmosfer lebih baik dari ekosistem darat. Metode pengolahan citra serta informasi mengenai potensi cadangan karbon pada padang lamun selanjutnya dapat dijadikan sebagai dasar pengelolaan stok karbon yang terdapat di pesisir dan pulau-puau kecil. Penelitian ini bertujuan untuk mengestimasi stok karbon padang lamun di perairan Pulau Kodingarenglompo menggunakan teknologi penginderaan jauh. Penelitian ini dilaksanakan dari bulan Maret sampai Agustus 2020. Tahapan survei lapangan yaitu mengidentifikasi persentase tutupan jenis padang lamun sebanyak 62 plot titik. Stok karbon lamun diketahui berdasarkan data persentase tutupan lamun menggunakan persamaan regresi. Estimasi stok karbon padang lamun pada daerah kajian dibedakan menjadi dua yaitu AGC dan BGC. Tahap pengolahan citra yaitu dengan menggunakan algoritma regresi random forest dalam memetakan stok karbon lamun. Hasil survei penelitian ini mendapatkan enam jenis lamun yaitu Cymodocea rotundata, Enhalus acoroides, Halodule uninervis, Halophila ovalis, Thalassia hemprichii dan Syringodium isoetifolium dan didominasi oleh 2 jenis lamun yaitu Thalassia hemprichii dan Enhalus acoroides. Hasil penelitian menunjukkan bahwa penginderaan jauh dapat digunakan untuk memetakan stok karbon lamun. Stok karbon lamun dapat dipetakan dengan akurasi maksimum 67% (SE=1,96 KgC/Piksel), 85% (SE=7,86 KgC/Piksel) untuk AGC dan BGC. Dari model tersebut, total stok karbon ekosistem pada lamun di perairan Pulau Kodingarenglompo diperkirakan sekitar 178,98 ton karbon organik dengan luas padang lamun yaitu 81,29 hektar. Ketersediaan peta stok karbon lamun sangat penting untuk memberikan pemahaman yang lebih baik tentang sebaran dinamika karbon spasial dan temporal.
      PubDate: 2023-06-14
      DOI: 10.14710/jkt.v26i2.16496
      Issue No: Vol. 26, No. 2 (2023)
       
  • Pemetaan Kerapatan Ekosistem Mangrove Menggunakan Analisis Normalized
           Difference Vegetation Index di Pesisir Kota Semarang

    • Authors: Fani Safitri, Luky Adrianto, I Wayan Nurjaya
      Pages: 399 - 406
      Abstract: Mangrove ecosystem in Semarang City has an important role for survival of the coastal area. This is due to the function of mangroves as a barrier to coastal erosion, wave barrier, carbon producer, as a habitat for biota in coastal areas, as well as improving water quality. However, as time goes by, mangroves condition in coastal of Semarang is decreasing every year and causing coastal disasters such as coastal erosion and tidal flooding which have identically occurred on the coast of Semarang. Mangrove ecosystem area in coastal of Semarang City in 2020 is 163,250 Ha. The aim of this study is to determine the density of mangroves ecosystem from 2013 to 2022 with Landsat 8 and Sentinel 2 satellites. The method used to classify and determine the density of mangroves ecosystem is NDVI or Normalized Difference Vegetation Index. The results of analysis show that the mangrove density in 2013 was 412.889 Ha, while in 2022 it was 142.562 Ha. The density of mangroves has decreased by around 270.327 Ha (65.5%), this is due to erosion, land conversion into pond areas, and recently the construction of the Semarang-Demak sea wall. Whereas Sentinel 2 satellite is better to use because it has better image quality, details, and accuracy to show objects on the earth's surface compared to Landsat 8.   Ekosistem mangrove di Kota Semarang memiliki peran yang penting bagi keberlangsungan hidup wilayah pesisir. Hal tersebut dikarenakan fungsi mangrove sebagai penahan erosi pantai, penahan gelombang, penghasil karbon, sebagai habitat bagi biota di wilayah pesisir, serta memperbaiki kualitas air. Namun seiring perkembangan zaman, kondisi mangrove di pesisir Semarang semakin tahun kian berkurang sehingga menimbulkan bencana pesisir seperti terjadinya erosi pantai dan banjir rob yang telah identik terjadi di pesisir Semarang.  Luas ekosistem mangrove di wilayah pesisir Kota Semarang pada tahun 2020 yaitu seluas 163,250 Ha. Tujuan dari penelitian ini yaitu untuk mengetahui kerapatan ekosistem mangrove dari tahun 2013 hingga 2022 dengan citra satelit Landsat 8 dan citra Sentinel 2. Metode yang digunakan untuk mengelaskan dan mengetahui kerapatan ekosistem mangrove adalah metode NDVI atau Normalized Difference Vegetation Index. Hasil analisa menunjukkan bahwa kerapatan mangrove pada tahun 2013 seluas 412,889 Ha, sedangkan pada tahun 2022 seluas 142,562 Ha. Kerapatan mangrove mengalami penurunan sekitar 270,327 Ha (65,5%), hal tersebut disebabkan karena adanya erosi, alih fungsi lahan menjadi area tambak, serta baru-baru ini yaitu adanya pembangunan tanggul laut Semarang-Demak. Sedangkan citra satelit Sentinel 2 merupakan citra yang lebih baik digunakan karena memiliki kualitas gambar yang lebih bagus, detail, dan akurat untuk menunjukkan obyek dipermukaan bumi dibandingkan dengan citra Landsat 8.
      PubDate: 2023-06-27
      DOI: 10.14710/jkt.v26i2.18173
      Issue No: Vol. 26, No. 2 (2023)
       
 
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  Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

OCEANOGRAPHY (88 journals)

Showing 1 - 79 of 79 Journals sorted by number of followers
Deep Sea Research Part II: Topical Studies in Oceanography     Hybrid Journal   (Followers: 28)
Estuaries and Coasts     Hybrid Journal   (Followers: 25)
Limnology and Oceanography     Hybrid Journal   (Followers: 25)
Hydrobiology     Open Access   (Followers: 25)
Deep Sea Research Part I : Oceanographic Research Papers     Hybrid Journal   (Followers: 23)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 21)
Frontiers in Marine Science     Open Access   (Followers: 20)
New Zealand Journal of Marine and Freshwater Research     Hybrid Journal   (Followers: 19)
Journal of Marine Biology & Oceanography     Hybrid Journal   (Followers: 19)
Progress in Oceanography     Hybrid Journal   (Followers: 18)
Journal of Marine Sciences     Open Access   (Followers: 18)
Coastal Engineering     Hybrid Journal   (Followers: 16)
Advances in Oceanography and Limnology     Open Access   (Followers: 16)
Maritime Studies     Open Access   (Followers: 13)
Journal of Oceanography     Hybrid Journal   (Followers: 12)
Advances in Statistical Climatology, Meteorology and Oceanography     Open Access   (Followers: 10)
Bulletin of Marine Science     Full-text available via subscription   (Followers: 9)
Atmospheric and Oceanic Science Letters     Open Access   (Followers: 9)
Fisheries Oceanography     Hybrid Journal   (Followers: 8)
International Journal of Oceanography     Open Access   (Followers: 8)
Physical Oceanography     Hybrid Journal   (Followers: 6)
Open Journal of Marine Science     Open Access   (Followers: 6)
Limnology and Oceanography: Fluids and Environments     Full-text available via subscription   (Followers: 6)
Journal of Oceanography and Marine Science     Open Access   (Followers: 6)
Oceanography : Open Access     Open Access   (Followers: 6)
Limnology and Oceanography: Methods     Hybrid Journal   (Followers: 6)
Paleoceanography and Paleoclimatology     Full-text available via subscription   (Followers: 5)
Marine Science     Open Access   (Followers: 5)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 4)
Journal of Marine Science and Engineering     Open Access   (Followers: 4)
Ocean Yearbook Online     Hybrid Journal   (Followers: 4)
Limnology and Oceanography Letters     Open Access   (Followers: 4)
African Journal of Marine Science     Hybrid Journal   (Followers: 3)
Journal of Marine Science and Application     Hybrid Journal   (Followers: 3)
Oceanology     Hybrid Journal   (Followers: 3)
Journal of Operational Oceanography     Hybrid Journal   (Followers: 3)
Journal of Coastal Development     Open Access   (Followers: 3)
Ciencias Marinas     Open Access   (Followers: 3)
Journal of Aquatic Sciences     Full-text available via subscription   (Followers: 3)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 3)
Limnology and Oceanography e-Lectures     Open Access   (Followers: 3)
Development and Applications of Oceanic Engineering     Open Access   (Followers: 2)
Indian Journal of Geo-Marine Sciences     Open Access   (Followers: 2)
Regional Studies in Marine Science     Hybrid Journal   (Followers: 2)
Limnology and Oceanography: Bulletin     Hybrid Journal   (Followers: 2)
Mediterranean Marine Science     Open Access   (Followers: 2)
Annals of Marine Science     Open Access   (Followers: 2)
Annals of Limnology and Oceanography     Open Access   (Followers: 2)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 1)
Scientia Marina     Open Access   (Followers: 1)
Western Indian Ocean Journal of Marine Science     Open Access   (Followers: 1)
Marine Technology Society Journal     Full-text available via subscription   (Followers: 1)
Journal of Ocean Engineering and Science     Open Access   (Followers: 1)
Ocean Life     Open Access   (Followers: 1)
Acta Aquatica : Aquatic Sciences Journal     Open Access   (Followers: 1)
Journal of Ocean Engineering and Technology     Open Access   (Followers: 1)
Tropical Oceanography     Open Access   (Followers: 1)
Marine Systems & Ocean Technology     Hybrid Journal   (Followers: 1)
Marine Life Science & Technology     Hybrid Journal   (Followers: 1)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 1)
Asian Journal of Fisheries and Aquatic Research     Open Access  
Thalassas : An International Journal of Marine Sciences     Hybrid Journal  
Oceans     Open Access  
Aquatic Research     Open Access  
Jurnal Kelautan Tropis     Open Access  
Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan     Open Access  
Journal of Agricultural and Marine Sciences     Open Access  
Turkish Journal of Maritime and Marine Sciences     Open Access  
Arquivos de Ciências do Mar     Open Access  
Scientific Drilling     Open Access  
Jurnal Kelautan : Indonesian Journal of Marine Science and Technology     Open Access  
Oceanologia     Open Access  
Revista de Gestão Costeira Integrada     Open Access  
Revista Ciencias Marinas y Costeras     Open Access  
Egyptian Journal of Aquatic Research     Open Access  
China Ocean Engineering     Hybrid Journal  
Revista de Biología Marina y Oceanografía     Open Access  
Latin American Journal of Aquatic Research     Open Access  
Acta Oceanologica Sinica     Hybrid Journal  
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