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Marine Fisheries : J. of Marine Fisheries Technology and Management     Open Access   (Followers: 3)
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Jurnal Ilmu dan Teknologi Kelautan Tropis
Number of Followers: 0  

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ISSN (Print) 2087-9423 - ISSN (Online) 2085-6695
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  • Back Matter

    • Authors: Dietriech G. Bengen
      Abstract: Back Matter
      PubDate: 2022-01-29
      DOI: 10.29244/jitkt.v13i3.39720
      Issue No: Vol. 13, No. 3 (2022)

    • Authors: Zulhamsyah - Imran, Romy Ketjulan, Yamao Masahiro
      Pages: 379 - 394
      Abstract: Sustainable marine spatial planning in small islands requires a more comprehensive management strategy. Unsustainable use problems and issues in both land and seascape need a strategic formulation to manage Tiworo Small Island in the future. This study aimed to formulate the strategy for sustainable marine spatial planning of the Tiworo Small Islands. The rapid Appraisal for Land Use (Raplanduse) method was used to assess the sustainability and sensitivity of the attributes used in this study. The formulation of management strategies was carried out based on the levels of influence and dependence on sensitive attributes analyzed by the prospective analysis method. The results showed that the sustainable use of small islands in the Tiworo Islands varied, ranging from good, bad to less sustainable. Sensitive attributes observed in the ecological dimension were suspended solid materials and seawater surface temperature. In the social dimension, the sensitive attributes assessed were the conflict incidence among residents and human resources. Attributes observed in the economic dimension were income level, availability of business capital, and fisheries catch production. In the legal and institutional dimensions, the sensitive attributes observed were land ownership status and area zoning. Strategic management was developed based on these sensitive attributes, including increasing community adaptation capacity, controlling land-use in watershed areas in the mainland, developing business diversification, regulating spatial utilization, and improving the quality of human resources.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.35311
      Issue No: Vol. 13, No. 3 (2021)

    • Authors: I Gusti Ayu Istri Pradnyandari Dewi, Elok Faiqoh, Abd. Rahman As-syakur, I Wayan Eka Dharmawan
      Pages: 395 - 410
      Abstract: Mangrove ecosystems have an important role in coastal areas either directly or indirectly. The preservation of the mangrove ecosystem can be described from the seedlings' abundance. Mangrove natural regeneration status was carried out in the Benoa Bay, Bali. The study was aimed to analyze the current natural mangrove regeneration based on the seedling abundance and its correlation with ecological characters. The study area was divided into three zones consist of 30 sampling quadratic plots in total. Seedling and mature stands community structure and environmental parameters data were collected from each plot. Based on the result, the mangrove regeneration state was categorized as fairly good condition. It was implied by seedling abundance compared with tree and sapling density. The highest seedling density was found in zone 2 which was dominated by Rhizophora mucronata with an average of 4800 ± 5610 stands/ha. It was significantly different from the other two zones. Variations of the community structure in the three zones had no significant influence on seedlings distribution. Only two environmental factors i.e. pH and redox potential, had a positive correlation and significant correlation with the abundance of mangrove seedlings. The result indicated that the mangrove regeneration state in this area was maintained even though it had faced variable threats.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.36364
      Issue No: Vol. 13, No. 3 (2021)
  • NURSERY OF CANTIK GROUPER (Epinephelus fuscoguttatus × Epinephelus

    • Authors: Belinda Astari, Tatag Budiardi, Irzal Effendi, Yani Hadiroseyani
      Pages: 413 - 427
      Abstract: Nursery of cantik grouper is generally carried out with regular water changes every day so that it is susceptible to decreased water quality and production performance. Grouper nursery with recirculation and bioremediation systems is expected to improve production performance by improving water quality. This study aims to analyze grouper nursery based on RAS (Recirculating aquaculture system) and bioremediation to improve aquabusiness efficiency. This study was conducted for 40 days using a completely randomized design with three treatments and four replications. The study used three treatment systems, namely conventional systems without recirculation and without bioremediation (SK), recirculation systems without bioremediation (RAS), and recirculation and bioremediation systems (RB). The fish used in the research were grouper seeds with an average initial length of 3.6±0.2 cm with a stocking density of 500 fish/m3. The results showed that the best survival rate and absolute length growth rate were obtained in the recirculation system with bioremeciation of 94.8±0.37%, and 0.1098±0.0029 cm/day. Grouper nursery business with recirculation and bioremediation systems was able to increase profits by 41.76% and 8.81% more efficiently than the routine water change system.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.36198
      Issue No: Vol. 13, No. 3 (2021)
           SKIPJACK TUNA Katsuwonus pelamis IN MAKASSAR STRAIT

    • Authors: Andi Risda Fitrianti Abudarda, Mukti Zainuddin, Safruddin
      Pages: 429 - 439
      Abstract: Makassar Strait plays a vital role as one of the skipjack tuna fishing grounds in Indonesia. This study aimed to detect the skipjack tuna preference of sea surface temperature (SST) and chlorophyll-a (Chl-a) in Makassar Strait and to map out the possible shifting potential fishing zone (PFZ) of skipjack tuna by simulating sea surface temperature increase. We analyzed the skipjack catch data from July to November 2020, and we added the previous data in June, July, August, October, and December 2019 in the same study area. We analyzed together with satellite imagery data set of SST and Chl-a using GAM. We used three scenarios for the SST increase model simulation, which are 0.25, 0.5, and 1℃. The results showed that skipjack tuna is relatively high in SST ranging from 28.3 to 30.4°C and Chl-a ranging from 0.18 to 0.28 mg/m3. The PFZ based on sea surface temperature simulation showed that PFZ area form in the northern part shifting to the southern part of Makassar Strait based on the increasing sea surface temperature simulation visible in September, which shifted from 0.017-5.421⁰S to 2.923-6.802⁰S and October shifted from 0.017-6.802⁰S to 5.007-6.802⁰S. Knowing the shifting of the potential fishing zone of skipjack tuna could be an important step toward fishing operation and management for skipjack tuna resource management in Makassar Strait.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.35692
      Issue No: Vol. 13, No. 3 (2021)

    • Authors: Aceng Hidayat, Dessy Rachmawatie Dessy
      Pages: 441 - 456
      Abstract: Mangroves are one of the main coastal ecosystems, if the mangrove ecosystem is damaged it will have detrimental impact on humans and the surrounding habitat. This study discusses three issues, (1) how the phenomenon of forest deforestation in the period 1972-2013 in Tanakeke, (2) how the potential for deforestation of land use cover of mangroves in the island of Tanakeke, (3) how the institutional concept that occurred on Tanakeke Island during the period 1972-2013. The data used in this study are secondary data obtained from the results of previous research. The analytical method used is quantitative and qualitative data analysis. The results of this study indicate land conversion massive mangrove ecosystem has occurred since 1972-1993 implicated in a broad decline that reached 1166.61 hectare mangrove. Whereas from 1993-2013 the area of ​​mangrove forest cover that was lost due to the conversion of mangrove land into ponds reached 32.25% within 20 years. Deforestation that occurred on Tanakeke Island resulted in a decline in the level of community welfare and environmental damage. The phenomenon of damage mangrove encourages some institutions to motivate directly involvement society Tanakeke island to form of institutional andpolicy in maintaining the continuity of the mangrove ecosystem.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.38502
      Issue No: Vol. 13, No. 3 (2021)

    • Authors: Ikhsan Kamil, Ernan Rustiadi, Tridoyo Kusumastanto, Eva Anggraini
      Pages: 457 - 467
      Abstract: In 1990, grouper cultivation using floating net cages (KJA) was developed to meet market demand. This study aimed to assess the suitability and zoning of water towards the physical carrying capacity of the Lampung bay area for grouper cultivation in floating net cages (KJA). The suitability assessment was based on physical, chemical, and socio-economic aspects. The physical carrying capacity of the area was analyzed from the results of the suitability criteria. The area that met the suitability criteria of Lampung bay were high (67.64 ha), medium (5,838.17 ha), low (3,214.89 ha), and not suitable (35.95 ha). The next step is overlaying with zoning; it has a result that a decrease of the area of ​​high suitability to (1,446. 28 ha), medium (23.71 ha), and low (440.05) ha and not suitable area increased to (7,226.62 ha). The physical carrying capacity of the Teluk Lampung area is 13,450 KJA units or with a production potential of 24,754 tons. With a decrease in the suitable area, the physical carrying capacity will decrease to 4,545 units of KJA or a production potential of 8,365 tons. The results of this study indicate that the overlay with the zoning plan reduces the area suitable for KJA cultivation activities which in turn causes a decrease in the physical carrying capacity of the area.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.35577
      Issue No: Vol. 13, No. 3 (2021)
           JAKARTA BAY

    • Authors: Lalu M Iqbal Sani, Azhari Benyamin, Alief K Husna, Dondy Arafat, Beginer Subhan, Adriani Sunuddin, Nadya Cakasana, Dea Fauzia Lestari, Dr. Hawis Madduppa
      Pages: 469 - 484
      Abstract: The existence of reef fish is certainly closely related to the existence of reefs coral because the ecosystem is a habitat for reef fish. Coral reefs are ecosystems that are commonly found on small islands in the tropics including the Seribu Islands. The Seribu Islands are a group of 110 islands located off the coast of Jakarta and up to 80 kilometers north of the Java Sea. In this study, we examined the species distribution and diversity of reef fish species on two different distance location in Jakarta Bay using environmental DNA (eDNA) metabarcoding analysis from two sites which are Untung Jawa Island and Harapan Island. The 4L eDNA seawater samples were collected at a depth of 8-9 meters at each site and then analysis using specific primer (MiFish U) of 12S rRNA. Overall, the higher species richness was found on Harapan Island (52 species) followed by Untung Jawa Island (11 species). The Shannon-Wiener Index also showed Harapan Island has higher reef fish diversity based on three taxonomic level (family, genus, and species). There were only five mutual reef fish species found in the two locations, namely Atherinomorus aetholepis, Auxis thazard, Cephalopholis sexmaculata, Epinephelus chlorostigma, and Plectropomus areolatus. The results of these findings in this current study are in line with anthropogenic pressure different where Untung Jawa Island is the closer one to Jakarta Bay than the Harapan Island that located relatively far from Jakarta Bay.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.37971
      Issue No: Vol. 13, No. 3 (2021)

    • Authors: Anak Agung Eka Andiani, I Wayan Gede Astawa Karang , I Nyoman Giri Putra, I Wayan Eka Dharmawan
      Pages: 485 - 498
      Abstract: Mangrove is one of coastal ecosystem which has a major role to sequastrate and store carbon. Mangrove stand structure delivers a significant contribution for estimating biomass carbon stock through individual scale allometric equations. On the other hand, the aboveground carbon research on the community scale was conducted in Teluk Benoa. The study aimed to establish a model for estimating mangrove aboveground carbon stock from the multiple variables of mangrove stand structure. A stratified purposive sampling method was applied for distributing quadratic samples. Three mangrove zones (1–3) were identified using mRE-SR (modified red edge-simple ratio) interpretation based on mangrove species domination. A common allometric equation was applied for estimating aboveground carbon stock. The result showed that mangrove stand structure in zone 1 was significantly different to other zones. Aboveground carbon stock was 193.45±34.88 tons C/ha on entire sites. It was found highest in zone 1 which was dominated by Sonneratia alba. The linear regression and Akaike’s Information Criterion (AIC) analysis showed that the combination of canopy cover, tree density, sapling density and tree diameter became the best model in estimating carbon stock at the community scale. The multiple model had the highest regression coefficient and the lowest root mean square error (RMSE) value. We expect that the multiple variable model could be more efficient and accurate to estimate aboveground carbon stock on community scale.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.36363
      Issue No: Vol. 13, No. 3 (2021)

    • Authors: Hendrik Alexander William Cappenberg, Ernawati Widyastuti, I Wayan Eka Dharmawan
      Pages: 499 - 520
      Abstract: Merauke Regency is located in the southern part of Papua, directly adjacent to Papua New Guinea. It has a mangrove ecosystem that is still good (pristine) which is quite extensive and rich in molluscs and crustaceans which are key fauna in the mangrove ecosystem. The aims of this research were to know the structure of molluscs and crustaceans community in mangrove ecosystem in this area. A study was conducted in October 2019 in 13 stations. Molluscs and crustaceans sample were collected in each location using a plot measuring 10 x 10 m. Samples were taken for 20 minutes by the same two people in each plot at low tide. From this study found 11 species of the crustaceans and 6 species of the molluscs. Cerithidea obtusa, Littoraria scabra and Cassidula angulifera of the molluscs group were macrobenthos that had a relatively wide distribution. The highest abundance was found in MRKM22 station (5.67 individuals/m2) and the lowest was in MRKM33 (0.25 individuals/m2). The molluscs and crustaceans found in this study were common species in mangrove ecosystem. The value of species diversity index (H') ranged from 0.63 to 1.56. This value indicated the diversity of molluscs and crustaceans species was of low-moderate condition. Evenness index (J') ranged from 0.56 to 0.99 and dominance index (C) ranged from 0.24 to 0.56. In general, these ecological values showed that the molluscs and crustaceans community in each station is in a relatively stable condition.
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.35132
      Issue No: Vol. 13, No. 3 (2021)

    • Authors: iing Burhanis, Edwarsyah, Radhi Fadhillah, Zulfadhli
      Pages: 521 - 527
      Abstract: Simeulue Regency is surrounded by small islands rich in diverse fish resources, namely dogtooth tuna. The interaction (reciprocity) between groups of organisms and their environment plays an important role in ecological systems. The determination of ecological status can be used to monitor, manage, and sustain waters in tuna fishing areas. Fishing activities will affect environmental changes that will impact marine biota's sustainability, existence, and diversity. This study aimed to analyze the ecological sustainability status of tuna fishing areas in East Simeulue waters. The research was conducted in May-July 2021. The method used in this research was observing and measuring the characteristics of the aquatic environment and conducting interviews. The attributes seen include the condition of the aquatic environment, conservation of pelagic resources, fishing activities, utilization of pelagic resources, environmental carrying capacity, type of fishing gear, the volume of fishing gear, level of suitability for fishing. The sustainability status of the ecological dimension obtained a value of 79.74. The results obtained are classified as well sustainable.  
      PubDate: 2021-12-31
      DOI: 10.29244/jitkt.v13i3.38553
      Issue No: Vol. 13, No. 3 (2021)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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