Data on the presence and characteristics of smooth scallop Flexopecten glaber (Linnaeus, 1758) aggregations in various parts of the Black Sea shelf (BSS) have been subjected to a retrospective analysis. The waters of the northern (Crimean coast), eastern (Central and North Caucasian), and Anatolian sectors of BSS can be considered the most favorable habitats for smooth scallop, where massive beds of this species were found in the first half of the 20th century. However, no such data are available for the northwestern and western BSS, where freshwater discharges from the Danube, Dniester, and Dnieper form a permanent zone of lower water salinity. The period of decline in the Black Sea scallop population recorded in the 1970s–1990s generally coincided with the well known ecological crisis due to the anthropogenic eutrophication of the Black Sea in the second half of the 20th century. In the late 2000s and the 2010s, the scallop beds in the Crimean BSS showed a tendency to recover, which may be associated with the general improvement of the ecological condition of the Black Sea basin. A similar recovery of scallop beds is expected to occur in the eastern (North and Central Caucasian) and southern BSS, but has not yet been recorded. The results obtained suggest a possibility of downgrading the conservation status of this species in the Red Data Books of the City of Sevastopol and the Republic of Crimea from the `species declining in abundance` to the `species recovering in abundance and distribution`.
{"title":"Long-term Variations in the Black Sea Population of Smooth Scallop, Flexopecten glaber (Linnaeus, 1758) (Bivalvia: Pectinidae): A Review","authors":"N. Revkov, T. Revkova","doi":"10.4194/trjfas22610","DOIUrl":"https://doi.org/10.4194/trjfas22610","url":null,"abstract":"Data on the presence and characteristics of smooth scallop Flexopecten glaber (Linnaeus, 1758) aggregations in various parts of the Black Sea shelf (BSS) have been subjected to a retrospective analysis. The waters of the northern (Crimean coast), eastern (Central and North Caucasian), and Anatolian sectors of BSS can be considered the most favorable habitats for smooth scallop, where massive beds of this species were found in the first half of the 20th century. However, no such data are available for the northwestern and western BSS, where freshwater discharges from the Danube, Dniester, and Dnieper form a permanent zone of lower water salinity. The period of decline in the Black Sea scallop population recorded in the 1970s–1990s generally coincided with the well known ecological crisis due to the anthropogenic eutrophication of the Black Sea in the second half of the 20th century. In the late 2000s and the 2010s, the scallop beds in the Crimean BSS showed a tendency to recover, which may be associated with the general improvement of the ecological condition of the Black Sea basin. A similar recovery of scallop beds is expected to occur in the eastern (North and Central Caucasian) and southern BSS, but has not yet been recorded. The results obtained suggest a possibility of downgrading the conservation status of this species in the Red Data Books of the City of Sevastopol and the Republic of Crimea from the `species declining in abundance` to the `species recovering in abundance and distribution`.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47635161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Different gas formulations with inclusion of hydrogen were evaluated for extension of shelf life of chilled rainbow trout. A control and four treatment samples were as follows: Control (air), MAP1 (50% CO2 / 50% N2), MAP2 (60% CO2 / 40% N2), RAP1 (50% CO2 / 46% N2 / 4% H2) and RAP2 (60% CO2 / 36% N2 / 4% H2). Samples were stored at +2±1°C for 15 days and periodically analyzed for changes in their quality. TBARS exceeded consumable limits in control after 5 days while treatment samples were under the limit during storage. Consumable limits for TVB-N were exceeded after 7 days in control while treatment samples remained below the limit. The modified atmosphere was significantly effective in retarding protein degradation although a modest difference was observed due to hydrogen inclusion. Gradually increased microbial counts also confirmed quality loss in control while a rather limited change was observed under a modified atmosphere. Microbial loads of treated samples were under consumable limits until the 10th day, while control reached to limits by just the 3rd day. The incorporation of molecular hydrogen in a modified atmosphere may bring benefits to the seafood industry although further research is needed.
{"title":"Hydrogen Inclusion in Modified Atmosphere Extends the Shelf Life of Chilled Rainbow Trout Fillets","authors":"M. Bulut, Gülistan Okutan, D. Alwazeer, G. Boran","doi":"10.4194/trjfas22515","DOIUrl":"https://doi.org/10.4194/trjfas22515","url":null,"abstract":"Different gas formulations with inclusion of hydrogen were evaluated for extension of shelf life of chilled rainbow trout. A control and four treatment samples were as follows: Control (air), MAP1 (50% CO2 / 50% N2), MAP2 (60% CO2 / 40% N2), RAP1 (50% CO2 / 46% N2 / 4% H2) and RAP2 (60% CO2 / 36% N2 / 4% H2). Samples were stored at +2±1°C for 15 days and periodically analyzed for changes in their quality. TBARS exceeded consumable limits in control after 5 days while treatment samples were under the limit during storage. Consumable limits for TVB-N were exceeded after 7 days in control while treatment samples remained below the limit. The modified atmosphere was significantly effective in retarding protein degradation although a modest difference was observed due to hydrogen inclusion. Gradually increased microbial counts also confirmed quality loss in control while a rather limited change was observed under a modified atmosphere. Microbial loads of treated samples were under consumable limits until the 10th day, while control reached to limits by just the 3rd day. The incorporation of molecular hydrogen in a modified atmosphere may bring benefits to the seafood industry although further research is needed.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48500215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mahmut Yanar, Ece Evliyaoglu, Bilge Kaan Tekelioglu
Thermal tolerance and intersexual differences of nine ornamental fish species (Chindango demosoni, Aulonocara stuartgranti, Mylandia lombardoi; Cichlidae; Carassius auratus, Pethia conchonius, Branchydanio rerio; Cyprinidae; Xiphophorus helleri, X. maculatus, Poecilia reticulate; Poecilidae) were determined in this study. CT-min of the species ranged between 9.63 and 11.37 in poecilids, 11.29 and 12.53 in cichlids, 4.67 and 8.46°C in cyprinids, while CT-max ranged between 39.12 and 40.53 in poecilids, 37.82 and 39.37 in cichlids, 36.12 and 40.30°C in cyprinids. While intersexual differences in the CT-min/CT-max values were not evident in cichlids and cyprinids, these values significantly differed across poecilids. The females of poecilids were approximately 0.5 to 1°C more resistant to both low and high temperatures than their males. Among the species included in our study, due to their resistance to low temperature, especially C. auratus and a lesser extent B. rerio and P. conchonius were considered the most suitable ones for outdoor aquaculture in subtropical regions. However, if they are cultured outside of their natural distribution, it should be noted that upon escapement from aquaculture facilities to nature, they may interfere with the ecosystem and compete with native species there due to their wide range of thermal tolerance.
{"title":"Sex Differences in Thermal Tolerance of Nine Ornamental Fish Species from the Poecilidae, Cichlidae and Cyprinidae Family","authors":"Mahmut Yanar, Ece Evliyaoglu, Bilge Kaan Tekelioglu","doi":"10.4194/trjfas22738","DOIUrl":"https://doi.org/10.4194/trjfas22738","url":null,"abstract":"Thermal tolerance and intersexual differences of nine ornamental fish species (Chindango demosoni, Aulonocara stuartgranti, Mylandia lombardoi; Cichlidae; Carassius auratus, Pethia conchonius, Branchydanio rerio; Cyprinidae; Xiphophorus helleri, X. maculatus, Poecilia reticulate; Poecilidae) were determined in this study. CT-min of the species ranged between 9.63 and 11.37 in poecilids, 11.29 and 12.53 in cichlids, 4.67 and 8.46°C in cyprinids, while CT-max ranged between 39.12 and 40.53 in poecilids, 37.82 and 39.37 in cichlids, 36.12 and 40.30°C in cyprinids. While intersexual differences in the CT-min/CT-max values were not evident in cichlids and cyprinids, these values significantly differed across poecilids. The females of poecilids were approximately 0.5 to 1°C more resistant to both low and high temperatures than their males. Among the species included in our study, due to their resistance to low temperature, especially C. auratus and a lesser extent B. rerio and P. conchonius were considered the most suitable ones for outdoor aquaculture in subtropical regions. However, if they are cultured outside of their natural distribution, it should be noted that upon escapement from aquaculture facilities to nature, they may interfere with the ecosystem and compete with native species there due to their wide range of thermal tolerance.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136327434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Heidarieh, S. Naeimi, Ava Resae, Tahmineh Heidarieh
The aim of this study was to investigate the effects of dietary supplementation of γ-irradiated cinnamon ethanolic extract on the growth performance, digestive enzymes, lysozyme activity level and hematological factors in the juvenile rainbow trout. The fish were divided into five groups, including control group and four experimental groups (received diets enriched with 10 g/kg of non-irradiated or irradiated CEE at the radiation doses of 10, 20 and 40 KGy. At the end of the feeding trial (60` days), 10 fish were sampled from each tank after 12 h of feed deprivation. The results showed that the fish dietary irradiated CEE at doses of 10 KGy and 20 KGy had significantly higher final weights, weight gain, specific growth rates and growth hormone levels, and lower feed conversion ratios compared to the other groups (P≤0.05). The blood glucose level significantly lowered in the fish group fed with dietary γ-irradiated CEE, and increased the activity of lysozyme activity level and digestive enzymes compared to the control group (P≤0.05). In conclusion, dietary supplementation of γ-irradiated CEE at a dose of 10 KGy can enhance the positive effects of cinnamon extract and improve the growth performance, digestion and lysozyme activity in juvenile rainbow trout.
{"title":"Changes in Juvenile Rainbow Trout (Oncorhynchus mykiss) Growth Performance, Digestive Enzyme Activity, Hematological Profile and Serum Biochemical Markers After Dietary Administration of γ-irradiated Cinnamon (Cinnamomum verum) Ethanolic Extract","authors":"M. Heidarieh, S. Naeimi, Ava Resae, Tahmineh Heidarieh","doi":"10.4194/trjfas22229","DOIUrl":"https://doi.org/10.4194/trjfas22229","url":null,"abstract":"The aim of this study was to investigate the effects of dietary supplementation of γ-irradiated cinnamon ethanolic extract on the growth performance, digestive enzymes, lysozyme activity level and hematological factors in the juvenile rainbow trout. The fish were divided into five groups, including control group and four experimental groups (received diets enriched with 10 g/kg of non-irradiated or irradiated CEE at the radiation doses of 10, 20 and 40 KGy. At the end of the feeding trial (60` days), 10 fish were sampled from each tank after 12 h of feed deprivation. The results showed that the fish dietary irradiated CEE at doses of 10 KGy and 20 KGy had significantly higher final weights, weight gain, specific growth rates and growth hormone levels, and lower feed conversion ratios compared to the other groups (P≤0.05). The blood glucose level significantly lowered in the fish group fed with dietary γ-irradiated CEE, and increased the activity of lysozyme activity level and digestive enzymes compared to the control group (P≤0.05). In conclusion, dietary supplementation of γ-irradiated CEE at a dose of 10 KGy can enhance the positive effects of cinnamon extract and improve the growth performance, digestion and lysozyme activity in juvenile rainbow trout.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43444331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Siddegowda Gopalapura Shivanne Gowda, Bhaskar Narayan, S. Gopal
Fish sauce, a flavored condiment produced by traditional fermentation of low-value fish. The time of fermentation and biochemical safety of sauce are the major concern in traditional fermentation. The enzymatic and fermentative methods were employed to produce Sardine (Sardinella longiceps) sauce under optimized conditions using response surface method. Salt (20%, w/w) and papain (3%, w/w) were used for enzymatic production; while, salt (25%, w/w), sugar (7.5%, w/w) and lactic culture (10%, w/v; Pediococcus pentosaceus FSBP4-40) were employed in fermentative production. Significant change in bioactive components such as pH, non-enzymatic browning, non-protein nitrogen, degree of hydrolysis, titratable acidity, total soluble nitrogen, and total volatile base nitrogen was observed in treated samples compared to the control. Total antioxidant activity (as ascorbic acid, μg/ml), percent DPPH, ABTS, and superoxide anion scavenging activities of fermented sauce were higher at 3976±90, 53.11±0.5, 99.6±0.3, 67.7±0.5 respectively; as compared to enzyme-treated samples which showed 952±70, 31.46±0.5, 76.5±1.0, 61.8±1.4 for the respective parameters, after 180 days storage. Reducing potential was found significantly higher (P<0.05) in treated sauces compared to the control and fatty acid profile showed different changes. The study emphasizes the role of accelerating fermentation, either enzymatically or fermentatively, to produce biochemically and biofunctional superior Sardine sauce.
{"title":"Comparative Analysis of Bioactive Components of Enzymatically and Fermentatively Produced Fish Sauce from Sardine","authors":"Siddegowda Gopalapura Shivanne Gowda, Bhaskar Narayan, S. Gopal","doi":"10.4194/trjfas22102","DOIUrl":"https://doi.org/10.4194/trjfas22102","url":null,"abstract":"Fish sauce, a flavored condiment produced by traditional fermentation of low-value fish. The time of fermentation and biochemical safety of sauce are the major concern in traditional fermentation. The enzymatic and fermentative methods were employed to produce Sardine (Sardinella longiceps) sauce under optimized conditions using response surface method. Salt (20%, w/w) and papain (3%, w/w) were used for enzymatic production; while, salt (25%, w/w), sugar (7.5%, w/w) and lactic culture (10%, w/v; Pediococcus pentosaceus FSBP4-40) were employed in fermentative production. Significant change in bioactive components such as pH, non-enzymatic browning, non-protein nitrogen, degree of hydrolysis, titratable acidity, total soluble nitrogen, and total volatile base nitrogen was observed in treated samples compared to the control. Total antioxidant activity (as ascorbic acid, μg/ml), percent DPPH, ABTS, and superoxide anion scavenging activities of fermented sauce were higher at 3976±90, 53.11±0.5, 99.6±0.3, 67.7±0.5 respectively; as compared to enzyme-treated samples which showed 952±70, 31.46±0.5, 76.5±1.0, 61.8±1.4 for the respective parameters, after 180 days storage. Reducing potential was found significantly higher (P<0.05) in treated sauces compared to the control and fatty acid profile showed different changes. The study emphasizes the role of accelerating fermentation, either enzymatically or fermentatively, to produce biochemically and biofunctional superior Sardine sauce.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46292912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rajan Kumar, Dineshbabu A.P., S. Rahangdale, V. Vase, J. Gohel, V. Solanki
The majority of tropical fish stocks lack sufficient data for conventional fish stock assessment, making them data-poor fisheries. The status of stock assessment is even more dismal for the low value fishes or crustaceans landed by the trawlers in a significant quantity. Crustaceans like non-edible small crabs (Charybdis spp) and stomatopods form a significant component of the low-value bycatch landed along the northwest coast. Despite the high ecological importance of these groups and the recent declining trend in catches (2007-19), no attempts so far have been made to evaluate the stock status of these groups from the study region. As reliable time series catch and effort data for the individual species are not available, a recently developed length-based approach, LBB (Length Based Bayesian Biomass) estimation method is adopted for the present study. Two of the evaluated stocks, Charybdis hoplites and Miyakella nepa were found abundant (B/BMSY>1.1), whereas Oratosquillina interrupta (B/BMSY=0.94) was found slightly overfished. The sufficient number of larger individuals were found lacking in all three species (L95th/L∞<<1.0). A higher incidence of juveniles in catches was estimated for C. hoplites and O. interrupta (Lmean/Lopt<<1.0).
{"title":"Assessing Low Value Crustacean Bycatch Species Using Length Based Bayesian Biomass (LBB) Method, a Tool for Data Poor Fish Stock Assessment","authors":"Rajan Kumar, Dineshbabu A.P., S. Rahangdale, V. Vase, J. Gohel, V. Solanki","doi":"10.4194/trjfas22189","DOIUrl":"https://doi.org/10.4194/trjfas22189","url":null,"abstract":"The majority of tropical fish stocks lack sufficient data for conventional fish stock assessment, making them data-poor fisheries. The status of stock assessment is even more dismal for the low value fishes or crustaceans landed by the trawlers in a significant quantity. Crustaceans like non-edible small crabs (Charybdis spp) and stomatopods form a significant component of the low-value bycatch landed along the northwest coast. Despite the high ecological importance of these groups and the recent declining trend in catches (2007-19), no attempts so far have been made to evaluate the stock status of these groups from the study region. As reliable time series catch and effort data for the individual species are not available, a recently developed length-based approach, LBB (Length Based Bayesian Biomass) estimation method is adopted for the present study. Two of the evaluated stocks, Charybdis hoplites and Miyakella nepa were found abundant (B/BMSY>1.1), whereas Oratosquillina interrupta (B/BMSY=0.94) was found slightly overfished. The sufficient number of larger individuals were found lacking in all three species (L95th/L∞<<1.0). A higher incidence of juveniles in catches was estimated for C. hoplites and O. interrupta (Lmean/Lopt<<1.0).","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48196438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Mikeladze, Guranda Makharadze, Tinatin Joglidze, P. Vadachkoria, Lasha Salukvadze, Y. Leonchyk, S. Snigirov
The aim of this study is to assess the level of the red mullet stock exploitation in Georgian coastal waters using the CMSY, LBB and LB-SPR modeling methods. The samplings were carried out using bottom trawls in 2019-2021. In total 4957 individuals were sampling (1 508 cases age was determined using scales and otoliths). Average annual catch of the red mullet make up 11.7±3.3 t (0.3% of the total annual Black Sea countries landings). The total length ranged from 6.1 to 20.7 cm. 70% of landings consisted of 3+, 4+ and 5+ age. The length-weight relationship was calculated as W=0.0072 × L3.20. Average von Bertalanffy growth parameters were L∞=18.00±0.27 cm, k=0.31±0.03, and t0= –0.93±0.26. LBB method demonstrate that the red mullet stock was overexploited (F/M=2.7 more than optimal level F/M=1.0). According to CMSY analysis, biomass has been decreasing to Blim for the researched period. The LB-SPR result showed that the estimated SPR was 23%. The exploitation of the stock was steadily intensive according to CMSY and LB-SPR methods. Increase in fishing mortality is not recommended.
本研究的目的是利用CMSY、LBB和LB-SPR模型方法评估格鲁吉亚沿海水域红鲻鱼种群的开发水平。这些取样是在2019-2021年使用底拖网进行的。共抽取4957例样本(1508例使用耳石和鳞片测定年龄)。红鲻鱼年平均捕获量为11.7±3.3吨(占黑海国家年总捕获量的0.3%)。总长度为6.1 ~ 20.7 cm。70%的着陆点为3+、4+和5+年龄段。长度-权重关系计算为W=0.0072 × L3.20。平均von Bertalanffy生长参数L∞=18.00±0.27 cm, k=0.31±0.03,t0= -0.93±0.26。LBB法表明，红鲻鱼种群处于过度开发状态(F/M=2.7，比最优水平F/M=1.0高出2.7)。根据CMSY分析，在研究期间，生物量呈下降趋势，降至3亿立方米。LB-SPR结果表明，估计SPR为23%。根据CMSY和LB-SPR方法，对该种群进行了稳定集约化开发。不建议增加捕鱼死亡率。
{"title":"Red Mullet (Mullus barbatus ponticus Essipov, 1927) Stock Exploitation in Georgian Coastal Waters (2019-2021)","authors":"R. Mikeladze, Guranda Makharadze, Tinatin Joglidze, P. Vadachkoria, Lasha Salukvadze, Y. Leonchyk, S. Snigirov","doi":"10.4194/trjfas22461","DOIUrl":"https://doi.org/10.4194/trjfas22461","url":null,"abstract":"The aim of this study is to assess the level of the red mullet stock exploitation in Georgian coastal waters using the CMSY, LBB and LB-SPR modeling methods. The samplings were carried out using bottom trawls in 2019-2021. In total 4957 individuals were sampling (1 508 cases age was determined using scales and otoliths). Average annual catch of the red mullet make up 11.7±3.3 t (0.3% of the total annual Black Sea countries landings). The total length ranged from 6.1 to 20.7 cm. 70% of landings consisted of 3+, 4+ and 5+ age. The length-weight relationship was calculated as W=0.0072 × L3.20. Average von Bertalanffy growth parameters were L∞=18.00±0.27 cm, k=0.31±0.03, and t0= –0.93±0.26. LBB method demonstrate that the red mullet stock was overexploited (F/M=2.7 more than optimal level F/M=1.0). According to CMSY analysis, biomass has been decreasing to Blim for the researched period. The LB-SPR result showed that the estimated SPR was 23%. The exploitation of the stock was steadily intensive according to CMSY and LB-SPR methods. Increase in fishing mortality is not recommended.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41831681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The study was carried out by taking samples from 10 different stations between the Giresun and Hopa coasts of the Southeastern Black Sea. In this study, the nutritional value of various edible body parts (carapace, right and left claw, and legs) of the warty crab (Eriphia verrucosa, Forsskål, 1775) was evaluated, sex seasonal proximal biochemical and fatty acid composition were compared. The highest content of protein (20.85%) was found in females (left claw) in winter and the highest content of fat (1.11%) in males (legs) in winter. Furthermore, the most dominant fatty acids in the fatty acid composition were Palmitic acid (11.2-13.9%) in SFA, Oleic acid (10.09-15.7%) in MUFA, and docosahexaenoic acid (DHA, 17.5-21.9%) in PUFA. There were no significant differences in SFA and MUFA contents in the fatty acid composition of female and male crab flesh meat samples except for the spring and summer seasons. However, Differences were obtained between the sexes in the n-3 and EPA+DHA fatty acid values in the spring season (p<0.05). In addition, the amount of EPA+DHA in 100g of edible crab meat was varied in 137.7-219.3 mg.
{"title":"Changes in the Biochemical and Fatty Acids Composition of Different Body Parts of Warty Crab (Eriphia Verrucosa, Forsskål, 1775) Caught from the Southeastern Black Sea and Their Relationship to Seasons and Sex","authors":"Bekir Tufan","doi":"10.4194/trjfas22160","DOIUrl":"https://doi.org/10.4194/trjfas22160","url":null,"abstract":"The study was carried out by taking samples from 10 different stations between the Giresun and Hopa coasts of the Southeastern Black Sea. In this study, the nutritional value of various edible body parts (carapace, right and left claw, and legs) of the warty crab (Eriphia verrucosa, Forsskål, 1775) was evaluated, sex seasonal proximal biochemical and fatty acid composition were compared. The highest content of protein (20.85%) was found in females (left claw) in winter and the highest content of fat (1.11%) in males (legs) in winter. Furthermore, the most dominant fatty acids in the fatty acid composition were Palmitic acid (11.2-13.9%) in SFA, Oleic acid (10.09-15.7%) in MUFA, and docosahexaenoic acid (DHA, 17.5-21.9%) in PUFA. There were no significant differences in SFA and MUFA contents in the fatty acid composition of female and male crab flesh meat samples except for the spring and summer seasons. However, Differences were obtained between the sexes in the n-3 and EPA+DHA fatty acid values in the spring season (p<0.05). In addition, the amount of EPA+DHA in 100g of edible crab meat was varied in 137.7-219.3 mg.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46736739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. R., Anil M.K., P. Sawant, Babitha Rani A.M., Ambarish P. Gop, G. P, S. S.
Ontogenetic development of the digestive tract and associated organs of Lethrinus lentjan larvae were learned by observing changes in external morphology, histology, and enzymatic changes from hatchling to 40-day post-hatching (dph). Ontogenetic development of the L. lentjan digestive system can be divided into three major stages; the first stage from hatching of larvae to complete absorption of yolk-sac, which ends on 2 dph, the second stage from 3 to 15 dph i.e., from exogenous feeding to the formation of the gastric gland and third stage till completion of metamorphosis (35 dph). Pyloric caeca were developed after 20 dph, which was formed entirely by 27 dph. Enzymatic activities of amylase, lipase, trypsin and chymotrypsin were detected before the onset of exogenous feeding and pepsin was detected from 19 dph onwards in L. lentjan. So considering both histology of digestive tract and enzyme development, weaning of L. lentjan larvae to artificial diet can be practiced after 19-20 dph coinciding with the formation of pyloric caeca and production of pepsin enzyme for better digestibility and consequently better growth and survival. The present study can be expended as a reference guide to understand the digestive tract development and successful hatchery rearing of other economically important marine fishes.
{"title":"Ontogenetic Development of Digestive Tract and Enzymes Activity in Hatchery-reared Pink Ear Emperor, Lethrinus lentjan Larvae","authors":"S. R., Anil M.K., P. Sawant, Babitha Rani A.M., Ambarish P. Gop, G. P, S. S.","doi":"10.4194/trjfas21151","DOIUrl":"https://doi.org/10.4194/trjfas21151","url":null,"abstract":"Ontogenetic development of the digestive tract and associated organs of Lethrinus lentjan larvae were learned by observing changes in external morphology, histology, and enzymatic changes from hatchling to 40-day post-hatching (dph). Ontogenetic development of the L. lentjan digestive system can be divided into three major stages; the first stage from hatching of larvae to complete absorption of yolk-sac, which ends on 2 dph, the second stage from 3 to 15 dph i.e., from exogenous feeding to the formation of the gastric gland and third stage till completion of metamorphosis (35 dph). Pyloric caeca were developed after 20 dph, which was formed entirely by 27 dph. Enzymatic activities of amylase, lipase, trypsin and chymotrypsin were detected before the onset of exogenous feeding and pepsin was detected from 19 dph onwards in L. lentjan. So considering both histology of digestive tract and enzyme development, weaning of L. lentjan larvae to artificial diet can be practiced after 19-20 dph coinciding with the formation of pyloric caeca and production of pepsin enzyme for better digestibility and consequently better growth and survival. The present study can be expended as a reference guide to understand the digestive tract development and successful hatchery rearing of other economically important marine fishes.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44343315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study was carried out to estimate the selectivity properties of gillnets for Tarek (Alburnus tarichi Güldenstädt, 1814) in Lake Van, Turkey. The Tarek is the most fished freshwater fish species in Turkey. The study was carried in 2021 fishing season at seven different sampling locations in the lake. Gillnet selectivity estimated was based on eight different gillnet mesh sizes (i.e. 1.25, 1.6, 2.0, 2.5, 3.1, 3.9, 4.4, 4.8 cm). The SELECT method was used to determine the selectivity parameters. According to the gamma model, optimum modal lengths for 1.25, 1.6, 2.0, 2.5, 3.1, 3.9, 4.4 and 4.8 cm mesh sizes were estimated as 6.61, 8.46, 10.58, 13.22, 16.39, 20.62, 23.27 and 25.38 cm respectively. When considering the minimum landing size, the findings of the study showed that use of gillnets which have less than 3.9 cm mesh size should be prohibited for the fishing of A. tarichi in Lake Van.
{"title":"Gillnet Selectivity Estimating for Sustainable Stock Management of Endemik Tarek (Alburnus tarichi Güldenstädt, 1814) Population in Lake Van (Eastern, Turkey)","authors":"Ferhat Demirol, Mehmet Cìlbìz","doi":"10.4194/trjfas21936","DOIUrl":"https://doi.org/10.4194/trjfas21936","url":null,"abstract":"This study was carried out to estimate the selectivity properties of gillnets for Tarek (Alburnus tarichi Güldenstädt, 1814) in Lake Van, Turkey. The Tarek is the most fished freshwater fish species in Turkey. The study was carried in 2021 fishing season at seven different sampling locations in the lake. Gillnet selectivity estimated was based on eight different gillnet mesh sizes (i.e. 1.25, 1.6, 2.0, 2.5, 3.1, 3.9, 4.4, 4.8 cm). The SELECT method was used to determine the selectivity parameters. According to the gamma model, optimum modal lengths for 1.25, 1.6, 2.0, 2.5, 3.1, 3.9, 4.4 and 4.8 cm mesh sizes were estimated as 6.61, 8.46, 10.58, 13.22, 16.39, 20.62, 23.27 and 25.38 cm respectively. When considering the minimum landing size, the findings of the study showed that use of gillnets which have less than 3.9 cm mesh size should be prohibited for the fishing of A. tarichi in Lake Van.","PeriodicalId":23978,"journal":{"name":"Turkish Journal of Fisheries and Aquatic Sciences","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44088905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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