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Aquatic Sciences and Engineering
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Online) 2602-473X
Published by İstanbul Üniversitesi Homepage  [18 journals]
  • Seasonal Feeding Biology of Catfish, Pachypterus atherinoides (Bloch,
           1794) with Special Reference to Lentic and Lotic Ecosystem

    • Authors: Arun Jana; Godhuli Sit, Angsuman Chanda
      Abstract: The study of food and feeding biology is extremely crucial in fishery. Pachypterus atherinoides (Bloch, 1794) is a good food and ornamental catfish in the world. The present study aims to examine the seasonal variation of feeding habits of P. atherinoides in both lentic and lotic ecosystems. The study was conducted over two years in selected lentic and lotic aquatic ecosystems of the Jhargram and Paschim Medinipur districts of West Bengal, India. The study reveals that P. atherinoides shows carni-omnivorous nature. Pearson’s correlation represents gastro-somatic index, relative gut length, and hepato-somatic index have significant positive correlation among them. Based on posthoc tests, it has been observed that the gastro-somatic index, relative gut length, and hepato-somatic index vary significantly both seasonally and in both lentic and lotic ecosystems. This study would help aquaculturists in the culture, captive breeding, and conservation of P. atherinoides and also help researchers in the biometric study of another fish.
      PubDate: Fri, 29 Mar 2024 00:00:00 +030
       
  • A Review on The Impact of Thermal Stress on Fish Biochemistry

    • Authors: Prasun Roychowdhury; Mohammad Aftabuddin, Manoj Kumar Pati
      Abstract: Fish are an important resource for humans, providing food, economic support, and ecological services. However, rising global temperatures and subsequent increases in their habitat water temperature, pose a significant challenge. We conducted a systematic review to understand the biochemical responses of thermal stress on fish. Stress can be acute (rapid exposure for a short duration) or chronic (repetitive long-term exposure). Stress responses occur at neurotransmitter and hormonal levels, progressing to peripheral and organism-wide effects. Prolonged stress leads to reduced growth, reproductive impairments, heightened infection susceptibility, and mortality. Elevated temperatures serve as abiotic stressors, triggering biotic stress responses. Fish employ strategies to cope with thermal stress, including altering gene expression, metabolite profiles, cellular signaling, and enzyme activity. Cumulative effects of thermal stress induce oxidative stress, causing cell death, organ failure, and mortality. Stressors increase the energy demand, prompting changes in hormonal, enzymatic, and biomolecular responses. Cortisol alters gene expression, stimulating glucose synthesis (gluconeogenesis). Other hormones (thyroid hormones, epinephrine, norepinephrine, insulin, glucagon) also play roles in the thermal stress response. Enzymes involved in metabolic pathways have optimal temperature and pH ranges altered by thermal stress. Heat shock proteins and warm acclimation proteins act as protective mechanisms by preserving the structural integrity of proteins, which is crucial for maintaining proper functionality and cellular responses. Further research is needed to expand on these molecular mechanisms to evaluate proper mitigation strategies.
      PubDate: Fri, 29 Mar 2024 00:00:00 +030
       
  • Investigation of Benthic Macroinvertebrate Fauna and Water Quality of
           Animal Drinking Water Troughs by Multivariate Statistical Methods: The
           Case of Şarkışla

    • Authors: Menekşe Taş Divrik
      Abstract: This study was conducted in 2022 to investigate the water quality and benthic macroinvertebrate fauna of water troughs in Şarkışla, a district in the city of Sivas. Fifteen stations were selected from the most used water troughs in the district and sampling was carried out in the spring, summer, and autumn seasons during peak agricultural activities. As a result, a total of 17 taxa were identified: 4 taxa belonging to Oligochaeta, 6 species belonging to Chironomidae, 2 taxa belonging to Amphipoda, and one each belonging to Gastropoda, Hemiptera, Coleoptera, Ostracoda and Trichoptera larvae. All taxa identified are new records for the study area. In addition to benthic sampling, some physicochemical parameters of water (water temperature, pH, electrical conductivity, dissolved oxygen, total hardness, calcium, magnesium, chloride, salinity, total dissolved solids, phosphate, sulphate, nitrate nitrogen, nitrite nitrogen) were also analyzed. The similarity of the stations in terms of physicochemical parameters was analyzed by utilizing the BrayCurtis similarity analysis. Accordingly, stations 2 and 4 were found to be the most similar, by 96.91%, and stations 3 and 13 were found to be the most different, by 66.46%. In addition, the relationship between the investigated physicochemical parameters was analyzed using the Pearson and Spearman Correlation Analysis. The relationship between the species and physicochemical parameters was revealed using the CCA Analysis.
      PubDate: Fri, 29 Mar 2024 00:00:00 +030
       
  • Bio-indicator Bacteria Levels in Riva Stream, an Important Stream in
           İstanbul, Türkiye

    • Authors: Pelin Saliha Çiftçi Türetken; Gülşen Altuğ, Meryem Öztaş, Selma Dilara Karaman Baş, Serap Koşal Şahin
      Abstract: Bacterial pollution is the presence of harmful bacteria in aquatic ecosystems, which can cause health problems if ingested. These bacteria originate from a variety of sources, including human and animal waste, agricultural runoff, and untreated sewage. This study aimed to assess the levels of bioindicator bacteria and their associations with various environmental parameters in surface water samples. The samples were collected seasonally from five stations along Riva Stream between March 2018 and January 2019. Indicator bacterial levels were determined using membrane filtration. Temperature, salinity, pH, dissolved oxygen, and conductivity values of the stations were measured in situ during sampling using a multiparameter (YSI). As a result of the sampling, maximum total coliform, fecal coliform, and intestinal enterococci levels were recorded as 24 x 103 CFU/100ml, 18 x 103 CFU/100ml and 24 x 102 CFU/100 ml, respectively. During sampling, the indicator bacterial levels were above the limit at all stations. When the FC/IE ratios were analyzed, the maximum FC/IE ratio was recorded as 52.10 during the winter sampling period at the station. The detection of bioindicator bacteria levels above the standard limit throughout the sampling period (especially during the summer period) was associated with a high level of domestic waste in the region. The results showed that more frequent and detailed monitoring studies should be conducted in this region.
      PubDate: Fri, 29 Mar 2024 00:00:00 +030
       
  • The Death of the Beluga Sturgeon (Huso huso) Rediscovered in the
           Küçükçekmece Lagoon: Let’s Focus on Causes

    • Authors: Devrim Memiş; Gökhan Tunçelli, Latife Köker, Özcan Gaygusuz
      Abstract: Sturgeon, a key species in fisheries and aquaculture due to their high economic and ecological value, face numerous challenges in their natural habitats. The spawning grounds in rivers, essential for sturgeon reproduction, are often compromised by the blockage of migration routes caused by various obstacles. Lagoons, providing favorable conditions for fish growth, are also hunting grounds for predatory fish species. The Küçükçekmece Lagoon, located within İstanbul's borders in Türkiye, stands as one of the most significant lagoons in the region, especially noted for its position on the bird migration route. However, it has been suffering from unplanned urbanization, leading to a notable decline in water quality due to improper urban planning and industrial activities over the years. This decline is aggravated by waste drainage into the lagoon's wetland area. Notably, the last sturgeon sighting in the Küçükçekmece Lagoon was in 1986. After approximately 35 years, the discovery of two deceased beluga sturgeon (Huso huso) in the lagoon, which connects to the Marmara Sea in Türkiye, marked a significant event. This study aims to investigate the causes behind the death of these beluga sturgeons and also proposes potential solutions for enhancing the ecosystem's vitality of the lagoon. These solutions include addressing waste drainage, ensuring shoreline compliance, improving the sediment structure laden with organic matter, and artificially introducing fresh water. Such measures are crucial for the restoration and maintenance of the ecological balance in the Küçükçekmece Lagoon, which is vital for the survival of significant species like the sturgeon.
      PubDate: Fri, 29 Mar 2024 00:00:00 +030
       
  • Revealing Mucilage Event-Linked Community Composition in the Sea of
           Marmara from eDNA Metabarcoding Data

    • Authors: Onur Doğan; Anıl Doğan Örün, Raşit Bilgin, Melek İşinibilir
      Abstract: Mucilage events are among the most conspicuous phenomena in marine ecosystems and present numerous challenges in determining the composition of communities associated with them. To overcome this problem, we used environmental DNA (eDNA) metabarcoding approaches to reveal the species-level resolution of community composition. Mucilaginous aggregates were sampled at six collecting sites during a novel mucilage event (autumn 2021–summer 2022) in the Sea of Marmara, Türkiye. A wide range of plankton community compositions was detected in mucilage samples. eDNA metabarcoding was effective in predicting the community composition of mucilage, which is composed of a wide variety of organisms from mucilaginous aggregates.
      PubDate: Fri, 29 Mar 2024 00:00:00 +030
       
  • Effect of Pozzolanic Cement Exposure in Nile Tilapia (Oreochromis
           niloticus)

    • Authors: Akif Er; Mert Minaz, Şevki Kayış
      Abstract: Cement used in structures such as bridges, dams, and retaining walls built on the aquatic ecosystem harms different organisms. The current study reveals the effect of pozzolanic cement (PC) on Nile Tilapia (Oreochromis niloticus). The LC50 value for O. niloticus exposed to 6 different PC concentrations for 24 hours was calculated as 306.66 mg L-1. Increasing PC concentration significantly increased the pH of water (<10) at the end of the study (p<0.05). The increase in pH level showed a positive correlation with the increase in fish mortality (p<0.05). In addition, PC negatively affected the hematological parameters of fish. Thus, the current study reveals the negative effects of PC on O. niloticus in the acute period. Future studies should focus on developing cement with environmentally friendly materials that will not affect the pH level of water.
      PubDate: Fri, 29 Mar 2024 00:00:00 +030
       
  • The establishment of the non-indigenous cyclopoid copepod Oithona davisae
           in Hamsilos Bay-Sinop, Southern Black Sea, Turkey

    • Authors: Funda Üstün; Tuba Terbiyik Kurt, Zeynep Hasançavuşoğlu
      Abstract: Hamsilos Bay, which is located within the first–degree natural protection area, is one of the most important regions on the southern Black Sea coast. Moreover, many fish species utilize this area for breeding and rearing activities. Small copepod Oithona davisae has been encountered in the Black Sea for two decades and spread rapidly the overall Black Sea, and become an important component in the pelagic ecosystem of the Black Sea. In this respect, the present study aims to characterize the distribution and abundance of Oithona davisae in Hamsilos Bay about environmental variables. Zooplankton samples were collected monthly from seven stations from July 2015 to June 2016 by using a plankton net with a mesh size of 112 μm and a diameter mouth opening of 50 cm. O. davisae was observed during the whole sampling period and was the dominant species from July 2015 to December 2015. The highest mean abundance of this species was recorded in September 2015 (3533.33 ind. m–3). However, the lowest mean abundance was observed between January 2016 (170.68 ind. m–3) and May 2016 (0.24 ind. m–3). Copepodites 5–4 were predominant in the O. davisae population in all months and all stations. Adult copepods and their copepodites 5–4 were more abundant between July 2015 and December 2015, whereas the abundance of copepodites 3–1 was maximum between September 2015 and December 2015. The abundance of O. davisae was highly correlated with chlorophyll-α and physiochemical variables (temperature, dissolved oxygen, and salinity). In conclusion, this species, which is known to be distributed only in the autumn conditions in close areas, extended its temporal distribution and prevailed in the copepod communities during warmer periods. This could be attributed to the acclimatization success of this species in Hamsilos Bay ecosystems.
      PubDate: Fri, 29 Mar 2024 00:00:00 +030
       
 
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Publisher: İstanbul Üniversitesi   (Total: 18 journals)   [Sort by number of followers]

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Alphanumeric J. : The J. of Operations Research, Statistics, Econometrics and Management Information Systems     Open Access   (Followers: 9)
Anadolu Araştırmaları / Anatolian Research     Open Access   (Followers: 1)
Aquatic Sciences and Engineering     Open Access  
Art-Sanat Dergisi     Open Access   (Followers: 2)
Conservatorium / Konservatoryum     Open Access  
Darulfunun Ilahiyat     Open Access  
European J. of Biology     Open Access   (Followers: 1)
J. of Penal Law & Criminology     Open Access   (Followers: 3)
J. of Transportation and Logistics     Open Access   (Followers: 3)
Public and Private Intl. Law Bulletin     Open Access   (Followers: 3)
Studien zur deutschen Sprache und Literatur     Open Access   (Followers: 4)
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