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  Subjects -> WATER RESOURCES (Total: 160 journals)
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Aquatic Sciences and Engineering
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  This is an Open Access Journal Open Access journal
ISSN (Online) 2602-473X
Published by İstanbul Üniversitesi Homepage  [18 journals]
  • Improving the Reproductive Yield of Black Sea Salmon (Salmo labraxPALLAS,
           1814) with a Selective Breeding Program

    • Authors: Eyüp ÇAKMAK; Şirin FİRİDİN, Nilgün AKSUNGUR, Yahya ÇAVDAR, İlker Zeki KURTOĞLU, Muharrem AKSUNGUR, Osman Tolga ÖZEL, Ekrem Cem ÇANKIRILIGİ, Zehra Duygu DÜZGÜNEŞ, Esin BATIR
      Abstract: This study aimed to improve some culture characteristics of Black Sea salmon (Salmo labrax) culture generations through a classical selective breeding program. Thus, the success of the applied program was examined by comparing the reproduction time and proportional distribution of the wild broodstock (F0) individuals with the F1, F2, F3 and F4 generation broodstocks adapted to the culture conditions. According to the results, gamete uptake from the new generations occurred between October and February. The highest egg uptake was determined for all generations in December. While the difference between wild (F0) broodstock and F1, F2, F3, and F4 generations was statistically significant in favor of new generations (P<0.05), the difference was insignificant between hatchery origin-new generations. Mean egg diameters were low in F2 and F3 generations, and F0, F1 and F4 generations were found to be higher than the others (P<0.05). It was calculated that the fertilization rate was higher in F3 and F4 generations, similar in F1 and F2 generations, and lower in F0 generation than the others (P<0.05) at the end of the study. Through the selection program, it was determined that the adaptation of the species to the culture conditions improved, the reaction to human activities declined, and homogeneous distribution in tanks/ponds was relatively achieved from the F2 generations. As a result, it has been determined that F4 generation broodstock have higher culture performance than other generations. Producers of this species should use F4broodstock for efficient and economical production.
      PubDate: Sat, 11 Jun 2022 00:00:00 +030
  • Cyanobacterial Diversity and the Presence of Microcystins in the Küçük
           Menderes River Basin, Turkiye

    • Authors: Latife KÖKER; Ayça OĞUZ ÇAM, Reyhan AKÇAALAN, Meriç ALBAY
      Abstract: Although cyanobacteria are commonly associated with eutrophic lakes, they are the basic compo-nents of phytoplankton communities in lakes that have different trophic statuses. In inland waters, both nutrient loading from watersheds and warmer conditions promote phytoplankton growth and cause extensive cyanobacterial blooms. Certain bloom-forming cyanobacterial species can pose a health risk to humans and aquatic ecosystems through cyanotoxin production. The aim of this study was to evaluate the cyanobacterial composition and toxins in five reservoirs and two natural lakes in the Küçük Menderes River Basin, all with varying trophic statuses. Within this scope, sam-ples were collected in autumn 2017 and spring 2018. Cyanobacterial species were enumerated according to the Utermöhl method. Cyanotoxin samples were analyzed using HPLC. To find the trophic status of the water bodies, the Trophic State Index (TSI) developed by Carlson (1977) was used and Total Phosphorus (TP), Secchi Depth (SD), and Chlorophyll-ɑ (chl-ɑ) measurements were performed. Cyanobacterial abundance, species composition, and cyanotoxin production differed significantly between the lakes and reservoirs. A total of 13 cyanobacteria species were identified including potential cyanotoxin producers such as Microcystis, Aphanizomenon, and Dolichospermum. According to the TSI, three reservoirs were mesotrophic and the other four waterbodies had eutro-phic-hypereutrophic conditions. Microcystis is the most common bloom-forming freshwater cyano-bacteria in the Küçük Menderes River Basin. However, microcystin concentrations were relatively low and the highest microcystin concentration was detected in the Tahtalı Reservoir at 9 μg/L. The Küçük Menderes River Basin is under water-stressed conditions and the cyanobacteria blooms in the region might pose another threat for wildlife and humans.
      PubDate: Sat, 11 Jun 2022 00:00:00 +030
  • Population Dynamics, Current Trends and Future Prospects of the Black Goby
           (Gobius niger) in the Eastern Part of the Black Sea (Turkiye)

    • Authors: Mehmet AYDIN; Uğur KARADURMUŞ
      Abstract: With its adaptation to the Black Sea, the black goby Gobius niger (Linnaeus, 1758) has increased in biological and ecological importance in recent years. Despite previous studies, up-to-date information on population status in the Black Sea is still lacking. Specimens were collected monthly from April 2020 to March 2021 from different commercial fishing landings on the Turkish coast of the eastern Black Sea. The total length of sampled individuals (n=630) ranged from 7.20 to 14.0 cm. Males were dominant throughout all size classes and the overall sex ratio was significantly different from the expected ratio of 1:1. The length-weight relationship indicated isometric growth (b=3) for both sexes. Spawning occurred from March to June. The observed maximum age was 4 and both males and females were dominant in age group 3. The black goby appeared to have relatively low growth rates (Φ′=1.74) in the Black Sea, but longer asymptotic length (L∞=16.94 cm) data were obtained in the study area. The total mortality rate (Z) estimated by means of the catch curve method was 1.43 yr-1 and the fishing mortality (F) was 0.88 yr-1. The estimated exploitation rate (E) was 0.61 yr-1 which was higher than the optimum value of 0.5. Updated biological parameter estimates show that black goby populations in the Black Sea are now more exploited than previously thought. Additional studies are recommended to ensure sustainable management of black goby populations and national regulations to reduce bycatch.
      PubDate: Sat, 11 Jun 2022 00:00:00 +030
  • Seasonal Differences in Lipid and Fatty Acid Composition of European Eels
           (Anguilla anguilla, Linnaeus 1758) from Orontes River, Turkiye

    • Authors: İdil CAN TUNÇELLİ; Özkan ÖZDEN, Nuray ERKAN
      Abstract: Seasonal differences in the lipid contents and fatty acid composition of European Eels (Anguilla anguilla, Linnaeus 1758) caught from the Orontes River (Hatay, Turkey) were determined. High lipid levels, as well as ω-3 and ω-6 fatty acids, are important factors in product quality. High-content lipid values of European eels from the Orontes River differed between seasons (p<0.05). The fatty acid compositions of eels ranged from 5.91-8.03 g/100 g in saturated fatty acids (SFA), 10.59-14.08 g/100 g in monounsaturated fatty acids (MUFAs), and 2.19-3.52 g/100 g in polyunsaturated fatty acids (PUFAs). Those present in the highest proportions were palmitic acid (C16:0, 62-67.51%), palmitoleic acid (C16:1, 15.67-19.07%), stearic acid (C18:0, 11.04-17.2%), oleic acid (C18:1ω-9, 70.67-72.44%), eicosapentaenoic acid (EPA) (C20:5ω-3, 12.77-22.83%), and docosahexaenoic acid (DHA, C22:6ω-3, 4.35-11.93%). Some fatty acids’ composition differed significantly (p<0.05) between seasons. In addition, the ratio of ω-3/ω-6 PUFAs varied between 1.14 and 1.72, reaching the highest value in autumn. The highest EPA+DHA contents were recorded during summer. In conclusion, analysis parameters show that commercially important European eels from the Orontes River are quite good sources of high-quality lipids and fatty acids.
      PubDate: Sat, 11 Jun 2022 00:00:00 +030
  • Evaluation of different scale-up strategies for Haematococcus pluvialis
           cultivation in airlift photobioreactor

    • Authors: Bahar ASLANBAY GÜLER; İrem DENİZ, Zeliha DEMİREL, Esra İMAMOĞLU
      Abstract: Large scale algal biomass production can be very challenging due to the potential issues of sustain-ability, environmental ethics, and economic concerns. A strategic approach to the transition from the laboratory to the industrial scale allows the prediction of process characteristics, design and analysis of large scale systems, and reduction of extra costs. In this study, a scale-up procedure that consid-ered different approaches was carried out by selecting the Haematococcus pluvialis as a model or-ganism. Three scale-up parameters (constant mixing time (tm), volumetric power consumption rate (P/V), and oxygen mass transfer coefficient (kLa)) were tested for biomass production in a 2-L airlift photobioreactor and they were compared with those obtained from a 1-L aerated cultivation bottle. Among three strategies, the maximum cell concentration, 4.60±0.20×105 cells/mL, was obtained in a constant volumetric power consumption rate experiment. Also, total carotenoid amount showed similar changes with the cell concentration and reached the maximum concentration of 2.02±0.11 mg/L under constant P/V experiment. However, the cultivation bottle presented the highest biomass amount of 0.62 g/L and specific growth rate of 0.38 day-1 of all of the photobioreactors. This result might be attributed to the low aeration rates or improper configuration of the system, which created a non-homogenous culture medium and led to ineffective mass transfer.
      PubDate: Sat, 11 Jun 2022 00:00:00 +030
  • The Effects of Climate Change on Aquatic Ecosystems in Relation to Human

    • Authors: Emine Gözde ÖZBAYRAM; Derya ÇAMUR, Latife KÖKER, Ayça OĞUZ ÇAM, Reyhan AKÇAALAN, Meriç ALBAY
      Abstract: This review paper aimed to summarize the climate change impacts on water sources and their re-lation with human and ecosystem health and evaluate better management strategies. In aquatic environments, climate change causes alteration of biodiversity and species distribution, changes in the duration of biological functions, decreasing productivities, alteration in food web structures, as well as triggering the invasion of various species, and variation in the presence, abundance, and concentrations of various co-stressors. Since the beginning of the 20th century, the surface water temperature in the oceans has risen by about 1°C. Consequently, human well-being is directly and indirectly affected by these alterations. The World Health Organization (WHO) estimates 3.5 mil-lion people die from water-related diseases each year. It is projected that the number of water-re-lated diseases will increase due to the effects of climate change. To cope with these problems, al-ternative water management strategies should be developed to have resilient water systems in terms of both ecological and technological perspectives. Thus, water management requires the cooperation of many sectors including citizens, institutions, public and private sectors, etc. within a multi-stakeholder approach.
      PubDate: Sat, 11 Jun 2022 00:00:00 +030
  • Fish Biodiversity at Kawadighi Haor of Northeastern Bangladesh: Addressing
           Fish Diversity, Production and Conservation Status

    • Authors: Md. Abu Hena Mostofa KAMAL; Md. Abu KAWSAR, Debasish PANDİT, Mrityunjoy KUNDA, Khushnud TABASSUM, Md. Tariqul ALAM
      Abstract: This research was conducted to explore the status of fish species diversity and production in the Kawadighi Haor of northeastern Bangladesh. Data were collected biweekly through direct catch assessment surveys, focus group discussions, and personal interviews using a questionnaire. A total of 87 fish and prawn species belonging 14 orders and 30 families were identified in the Haor, where 18% species were abundantly available, 20% were commonly available, 42% were moderately available and 20% were rarely available. Among the recorded species, Cypriniformes, having 34 species, had the most species, followed by Siluriformes (20), Anabantiformes (11), Ovalentaria (4), Synbranchiformes (4), Clupeiformes (3), Decapoda (3), Osteoglossiformes (2), Anguilliformes (1), Beloniformes (1), Cyprinodontiformes (1), Gobiiformes (1), Mugiliformes (1), and Tetraodontiformes (1). The values of Shannon-Weaver diversity (H), Margalef’s richness (d), and Pielou’s evenness (J) indices were 2.98, 7.72 and 0.67 in Hawagulaia, 2.97, 7.52 and 0.67 in Patasingra and 2.61, 7.30 and 0.59 in Salkatua beel, respectively. The haor's average yearly fish production was 704.09 kg/ha. Small indigenous species (SIS) of fish dominated the haor's total production, accounting for 51.8 to 70.57 percent of the total contribution. The highest portion of fish produced in the non-stocked beel was SIS of fish but per hectare SIS of fish production of non-stocked beel was lower than the fingerling stocked beels. Aquaculture might have a good effect on fish production and biodiversity. The findings showed that Kawadighi Haor is a very productive and biodiversity-rich inland open waterbody that may function as a mother fishery. For the protection of current fisheries resources, multiple approaches including public awareness campaigns might be beneficial.
      PubDate: Sat, 11 Jun 2022 00:00:00 +030
  • Benthic Macroinvertebrate Fauna of Some High-Altitude Lakes in the
           Aladağlar Mountains (Niğde)

    • Authors: Selda ÖZTÜRK; Sevil SUNGUR, Burak SEÇER, Erdoğan ÇİÇEK
      Abstract: This study was carried out in July and August 2019 as a preliminary study to determine the benthic macroinvertebrate fauna of Karagöl, Çömçe and Yıldız Lakes, which are high-altitude lakes in the Aladağlar mountains. As a result of the examination of the collected macrobenthic fauna, seven species belonging to three families from three orders (Diptera, Coleoptera and Trichoptera) in Karagöl Lake, four species belonging to three families from two orders (Diptera, Haplotaxida) in Çömçe Lake, and five species belonging to three families from three orders (Diptera, Trichoptera, Haplotaxida) in Yıldız Lake were determined. The taxa detected is a new record for the studied lakes. Shannon-Weaver diversity (H) and Shannon-Evenness density (EH) indices were applied in order to determine the species richness of the lakes and the density relationships among the species, respectively. Accordingly, the highest diversity was observed in Çömçe Lake with a value of 1.18, followed by Karagöl Lake, and Yıldız Lake with values of 0.87 and 0.83, respectively. While the most balanced distribution was observed in Çömçe Lake with a value of 0.81, this was followed by Yıldız Lake and Karagöl Lake, with values of 0.46 and 0.34, respectively. In order to determine the similarities between the stations according to the distribution of the detected taxa, a two-way clustering analysis based on the Bray-Curtis similarity index was applied. Accordingly, while the highest similarity was calculated between Karagöl Lake and Yıldız Lake, it was determined that there was no similarity between Yıldız Lake and Çömçe Lake.
      PubDate: Sat, 11 Jun 2022 00:00:00 +030
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