Purpose . To find qualitative and quantitative parameters of juvenile fish communities as a basis for commercial fish stock and biological diversity in the Dnipr о‐ Bug ria system. Methodology. Primary data were collected during summer ‐ spring period 2006 ‐ 2015 from catches of small ‐ mesh fishing gears for catching juvenile fish such as beach seine and trawl. In total, catches of 375 stations were analyzed; the total hauled area was more than 50 thousand m 2 of littoral shallow waters. To characterize commercial catches, the data of official fishery statistics. Data collection and processing were performed according to generally accepted methods. Findings . The data on species composition, abundance and distribution of juvenile fish communities in the Dnipro ‐ Bug ria system has been selected and analyzed. Major trends in the dynamics of catches of fish juveniles per unit effort as an integral feature of natural reproduction and basis for the recruitment of commercial fish stocks have been detected. Reproduction conditions of various ecological groups of fishes have been studied. The dynamics of the qualitative composition of commercial catches has been analyzed. Last years, the majority of commercial catches in the Dnipro ‐ Bug ria system consists of Black ‐ sea sprat (62.2%) and Prussian carp (21.4%); the category of “valuable commercial species” composed 7.3% of the total catch. Self ‐ reproductive fish populations ensured formation of 93.5% of the total catch. i.e. natural reproduction remains the major source of the recruitment of commercial fish stocks in the Dnipro ‐ Bug ria system. According to the data of studies of 2006 ‐ 2015, juveniles of 18 fish species were recorded in the littoral zone, the majority of which (56.3 ‐ 57.2%) were low value and secondary species – Prussian carp, Black ‐ sea sprat, atherina. Among valuable commercial species, the most abundant were roach (7.3%) and bream (3.4%); at the same time, these species formed 16.4% of the total catch in gill nets in 2010 ‐ 2017. The inter ‐ annual dynamics of the abundance of juveniles of commercial fish species during last 10 years has been characterized by positive trends that under condition of the maintenance of optimum hydrological regime of the Dnipro ‐ Bug ria system indicates in the possibility of ensuring stable commercial catches in the nearest future. Originality . The data on the structure of juvenile fish communities of the lower reaches of the Dnipro river as a component of fish fauna of the Dnipro ‐ Bug ria system have been provided. A detailed description of the dynamics of the number of juveniles of major commercial fish species in an inter ‐ annual aspect has been provided. Practical value . The obtained results have been used for the development of long ‐ term prognoses of fish productivity parameters as a basis for the regulation of qualitative and quantitative parameters of commercial fishing pressure and conservation measures.
{"title":"State and dynamics of commercial fish stock recruitment in the lower Dniprо river","authors":"K. Geina","doi":"10.15407/FSU2019.01.017","DOIUrl":"https://doi.org/10.15407/FSU2019.01.017","url":null,"abstract":"Purpose . To find qualitative and quantitative parameters of juvenile fish communities as a basis for commercial fish stock and biological diversity in the Dnipr о‐ Bug ria system. Methodology. Primary data were collected during summer ‐ spring period 2006 ‐ 2015 from catches of small ‐ mesh fishing gears for catching juvenile fish such as beach seine and trawl. In total, catches of 375 stations were analyzed; the total hauled area was more than 50 thousand m 2 of littoral shallow waters. To characterize commercial catches, the data of official fishery statistics. Data collection and processing were performed according to generally accepted methods. Findings . The data on species composition, abundance and distribution of juvenile fish communities in the Dnipro ‐ Bug ria system has been selected and analyzed. Major trends in the dynamics of catches of fish juveniles per unit effort as an integral feature of natural reproduction and basis for the recruitment of commercial fish stocks have been detected. Reproduction conditions of various ecological groups of fishes have been studied. The dynamics of the qualitative composition of commercial catches has been analyzed. Last years, the majority of commercial catches in the Dnipro ‐ Bug ria system consists of Black ‐ sea sprat (62.2%) and Prussian carp (21.4%); the category of “valuable commercial species” composed 7.3% of the total catch. Self ‐ reproductive fish populations ensured formation of 93.5% of the total catch. i.e. natural reproduction remains the major source of the recruitment of commercial fish stocks in the Dnipro ‐ Bug ria system. According to the data of studies of 2006 ‐ 2015, juveniles of 18 fish species were recorded in the littoral zone, the majority of which (56.3 ‐ 57.2%) were low value and secondary species – Prussian carp, Black ‐ sea sprat, atherina. Among valuable commercial species, the most abundant were roach (7.3%) and bream (3.4%); at the same time, these species formed 16.4% of the total catch in gill nets in 2010 ‐ 2017. The inter ‐ annual dynamics of the abundance of juveniles of commercial fish species during last 10 years has been characterized by positive trends that under condition of the maintenance of optimum hydrological regime of the Dnipro ‐ Bug ria system indicates in the possibility of ensuring stable commercial catches in the nearest future. Originality . The data on the structure of juvenile fish communities of the lower reaches of the Dnipro river as a component of fish fauna of the Dnipro ‐ Bug ria system have been provided. A detailed description of the dynamics of the number of juveniles of major commercial fish species in an inter ‐ annual aspect has been provided. Practical value . The obtained results have been used for the development of long ‐ term prognoses of fish productivity parameters as a basis for the regulation of qualitative and quantitative parameters of commercial fishing pressure and conservation measures.","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67112640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Current state of commercial fish fauna of the Dnipro river and Desna river within Chernihiv region","authors":"I. Buzevich","doi":"10.15407/FSU2019.01.005","DOIUrl":"https://doi.org/10.15407/FSU2019.01.005","url":null,"abstract":"","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47974138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. To study environmental conditions and individual fish culture parameters in the process of rearing brood sterlet herders in cages at natural temperature regime of water bodies of the forest ‐ steppe zone of Ukraine. Methodology . The material for the study were age ‐ 1–7 groups of sterlet reared in floating cages with areas of 24 m 2 . Fish were fed by specialized feeds with the content of crude protein of 45–64% and raw fat of ― 12–15%. The individual and mean body weight (g), relative weight gain (%) and fish survival rate (%) were studied; fish production per unit area of cages (kg/m 2 ) and feed costs per unit weight gain (kg/kg) were calculated). The determination of the physical and chemical parameters of the environment was carried out using generally accepted methods in fish culture and hydrochemistry. Findings. The mean monthly water temperature was in the range of 21.7–26.3°C in the summer. The period with a water temperature of 18–25°C was 75 ‐ 80 days. The mean daily content of dissolved oxygen varied within the range of 2.4–11.6 mgO 2 /dm 3 . The mean monthly oxygen concentration in summer was between 3.7 and 6.2 mgO 2 /dm 3 . During the period of fish rearing, minor excesses of normative values have been recorded for some hydrochemical parameters. No mass manifestations of fish diseases were detected. It was established that feed costs per unit of body weight gain (kg) increased with fish age, on average, from 1.29 to 1.98 kg. Fish production in cages was 5.33– 11.35 kg/m 2 . On the seventh year of life, the brood sterlet reached a mean weight of 1796.80 ± 73.33 g (Cv = 20.4%). Survival rates for sterlet of different age groups were 78.50–98.96%. The number of sterlet for the organization of caviar and meat production was calculated. Originality. Peculiarities of rearing different age groups of sterlet with the use of the methods of industrial aquaculture uncommon in Ukraine under conditions of cage aquaculture systems installed in water bodies with natural temperature regime have been investigated. Practical value . The results of the study are of interest for the development of modern methods of aquaculture of sturgeons in the conditions of farms of industrial type.
{"title":"To the question of rearing brood sterlet (Acipenser ruthenus Linnaеus, 1758) in floating cages at natural water temperatures of the forest-steppe of Ukraine","authors":"M. Pashko, O. Tretiak, O. Kolos","doi":"10.15407/FSU2019.01.048","DOIUrl":"https://doi.org/10.15407/FSU2019.01.048","url":null,"abstract":"Purpose. To study environmental conditions and individual fish culture parameters in the process of rearing brood sterlet herders in cages at natural temperature regime of water bodies of the forest ‐ steppe zone of Ukraine. Methodology . The material for the study were age ‐ 1–7 groups of sterlet reared in floating cages with areas of 24 m 2 . Fish were fed by specialized feeds with the content of crude protein of 45–64% and raw fat of ― 12–15%. The individual and mean body weight (g), relative weight gain (%) and fish survival rate (%) were studied; fish production per unit area of cages (kg/m 2 ) and feed costs per unit weight gain (kg/kg) were calculated). The determination of the physical and chemical parameters of the environment was carried out using generally accepted methods in fish culture and hydrochemistry. Findings. The mean monthly water temperature was in the range of 21.7–26.3°C in the summer. The period with a water temperature of 18–25°C was 75 ‐ 80 days. The mean daily content of dissolved oxygen varied within the range of 2.4–11.6 mgO 2 /dm 3 . The mean monthly oxygen concentration in summer was between 3.7 and 6.2 mgO 2 /dm 3 . During the period of fish rearing, minor excesses of normative values have been recorded for some hydrochemical parameters. No mass manifestations of fish diseases were detected. It was established that feed costs per unit of body weight gain (kg) increased with fish age, on average, from 1.29 to 1.98 kg. Fish production in cages was 5.33– 11.35 kg/m 2 . On the seventh year of life, the brood sterlet reached a mean weight of 1796.80 ± 73.33 g (Cv = 20.4%). Survival rates for sterlet of different age groups were 78.50–98.96%. The number of sterlet for the organization of caviar and meat production was calculated. Originality. Peculiarities of rearing different age groups of sterlet with the use of the methods of industrial aquaculture uncommon in Ukraine under conditions of cage aquaculture systems installed in water bodies with natural temperature regime have been investigated. Practical value . The results of the study are of interest for the development of modern methods of aquaculture of sturgeons in the conditions of farms of industrial type.","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47432672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Combination ability of few-scaled type of carp crossbred with Nyvka scaled carp. Growing of young-of-the-year. Message 1","authors":"H. Shyshman, V. Bekh, О. Oleksiyenko, M. Osipenko","doi":"10.15407/FSU2019.01.060","DOIUrl":"https://doi.org/10.15407/FSU2019.01.060","url":null,"abstract":"","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67112656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Influence of inactivated baker's yeast on growth potential of russian sturgeon Acipenser gueldenstaedtii (Brandt) fingerling","authors":"M. Simón, Yu. Zabytivskyi, I. Hrytsyniak","doi":"10.15407/FSU2018.03.103","DOIUrl":"https://doi.org/10.15407/FSU2018.03.103","url":null,"abstract":"","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48730616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Forming a replacement-brood stock of European grayling Thymallus thymallus (Linnaeus) in artificial conditions","authors":"A. Kucheruk, A. Mruk, I. Buzevitch","doi":"10.15407/FSU2018.03.028","DOIUrl":"https://doi.org/10.15407/FSU2018.03.028","url":null,"abstract":"","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67112575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The effect of amaranth Amaranthus (Linnaeus) on qualitative and productive characteristics of 1+ carp Cyprinus carpio (Linnaeus) after being added to the composition of the diet","authors":"R. Palamarchuk, O. Deren","doi":"10.15407/FSU2018.03.089","DOIUrl":"https://doi.org/10.15407/FSU2018.03.089","url":null,"abstract":"","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67112591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Small rivers of urbanized territories as an environment of ichthyocenosis","authors":"D. Medovnyk","doi":"10.15407/fsu2018.03.005","DOIUrl":"https://doi.org/10.15407/fsu2018.03.005","url":null,"abstract":"","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67112533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Sarieva, M. Aliiaskarov, B. Dzhenbaev, A. Sergekuulu
{"title":"Fish yield prediction in water bodies of the Kyrgyz republic","authors":"M. Sarieva, M. Aliiaskarov, B. Dzhenbaev, A. Sergekuulu","doi":"10.15407/FSU2018.03.016","DOIUrl":"https://doi.org/10.15407/FSU2018.03.016","url":null,"abstract":"","PeriodicalId":30821,"journal":{"name":"Ribogospodars''ka Nauka Ukraini","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47027083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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