Hatchery stock enhancement and conservation of sturgeon, with an emphasis on the Azov Sea populations

Chebanov, Mikhail; Karnaukhov, G. I.; Galich, E. V.; Chmir, Yu. N.

doi:10.1046/j.1439-0426.2002.00430.x

Cited by 51 publications

(45 citation statements)

References 5 publications

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“…The restocking programs implying the three Ponto-Caspian species are currently practiced by different countries, like Russia, Romania, Khazakstan, Azerbaidjan, Iran, etc.. In the former Soviet Union, the restocking programs started in the 1960s as a consequence of limitation of spawning grounds following the construction of dams (Secor et al , 2000; Chebanov et al , 2002; Doukakis et al , 2005). The Caspian basin has lost a considerable surface (almost 70%) of spawning grounds mainly due to hydro-electric power stations.…”

Section: Discussionmentioning

confidence: 99%

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Molecular analysis of phylogeographic subspecies in three Ponto-Caspian sturgeon species

2014

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Sturgeons (Order Acipenseriformes) represent an extremely valuable natural resource that is now facing depletion. In the current study we evaluate if the traditional classification in subspecies of Acipenser gueldenstaedtii, Acipenser stellatus and Huso huso, endemic to Ponto-Caspian region is sustained by molecular analysis and if these represent Evolutionary Significant Units (ESUs) that should be managed separately in conservation programs. To examine the classification of taxonomic entities we sequenced a fragment of the mitochondrial control region in case of three sturgeon species that inhabit the North-western of Black Sea and migrate for reproduction in the Lower Danube. Beside these sequences, we used previously published sequences from sturgeon individuals sampled in the Black Sea, Azov Sea and Caspian Sea. We determined the genetic diversity and genetic differentiation, conducted a Population Aggregation Analysis (PAA) and inferred an intraspecific molecular phylogeny and haplotype network. The results indicated a low level of genetic differentiation between the geographically designated subspecies and did not support a significant divergence or reciprocal monophyly between them. Our results confirm previous genetic studies with smaller samples sizes, but additional analyses including nuclear markers should be conducted for proper recommendations aiming at the development of conservation programs.

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Section: Discussionmentioning

confidence: 99%

“…Apparently, this was also a common practice for A. stellatus and A. gueldenstaedtii . For stellate sturgeon the introduction of fertilized eggs from the Caspian Sea into the Azov Sea affected the genetic integrity of Azov Sea population (Chebanov et al , 2002). …”

Section: Discussionmentioning

confidence: 99%

Molecular analysis of phylogeographic subspecies in three Ponto-Caspian sturgeon species

2014

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“…The dramatic reduction in sturgeon populations due to overfishing, poaching, pollution, and habitat alteration has led to the inevitability of commercial aquaculture as a tool for decreasing pressure on wild fish stocks as well as caviar and meat production (Beamesderfer and Farr 1997;Waldman and Wirgin 1997;Williot et al 2002;Chebanov et al 2002). The Siberian sturgeon (Acipenser baerii) is a one of the freshwater fish species which natively distributed in the major Siberian Rivers draining to the Kara, Laptev, and East Siberian seas (Bronzi et al 2011;Wei et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Dietary zinc requirement of Siberian sturgeon (Acipenser baerii, Brandt 1869) juveniles, based on the growth performance and blood parameters

et al. 2017

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This study investigated the effect of dietary Zn levels on growth performance, feed utilization, and hematological parameters of juvenile Siberian sturgeon (Acipenser baerii, Brandt 1869). The five semipurified diets were formulated by adding 0, 5, 10, 20, and 40 mg Zn kg -1 diet in the form of zinc sulfate (ZnSO 4 ) to provide the actual dietary value of 14.7, 20.8, 27.3, 37.7, and 46.4 Zn kg -1 diet, respectively. The results showed that dietary Zn elevating level significantly improved the growth and feed utilization of the fish (p \ 0.05), but not the hepatosomatic index (p [ 0.05). Erythrocyte number, hemoglobin concentration, and hematocrit were increased with raising dietary Zn level (p \ 0.05), whereas a regular trend was not observed in blood indices, including MCV, MCH, and MCHC. A significant increase was also found in the leucocyte number followed by their differential counts, except for eosinophil percentage. The broken line regression model indicated optimal dietary Zn level for growth maximization of fish was estimated to be 29.15 mg Zn kg -1 diet. In spite of well correlation with dietary Zn level, no break point was observed to estimate the juvenile Siberian sturgeon requirement based on the erythrocyte numbers.

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“…This aspect highlights the importance of hatcheries in conservation programs, since captive fish survival rates in early life stages can be significantly greater than those found in the wild (Secor et al 2002). Therefore, stocking practices should consider knowledge provided by studies of early life history in order to develop creative and adaptive aquaculture approaches that will allow support for better species conservation (Chebanov et al 2002;Secor et al 2002). This type of research-based approach in aquaculture is a promising avenue for sturgeon conservation.…”

Section: Introductionmentioning

confidence: 99%

European sturgeon (Acipenser sturio L.) young of the year performance in different rearing environments –study within a stocking program

2016

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The European sturgeon is critically endangered and the French ex-situ conservation approach involves developing a captive stock to produce offspring for release to boost natural populations. The purpose of our study was to assess the effects of rearing environment before stocking on the survival, growth, and behavior of threemonth-old sturgeons from two different crossings. Enriched rearing was designed to mimic the variability of the natural environment using river water, natural photoperiod, substrate, variable water current and depths. Traditional rearing was carried out with bare tanks, underground water, dark conditions, without current and at constant depth. Fish survival was determined monthly and growth was estimated weekly. Behavior was assessed with exploration and novel prey tests in solitary using video tracking. Results demonstrated that enriched condition resulted in bigger fish from the first month. Growth curve analysis revealed that enriched environment made both fish crossings grow in a similar manner. In contrast, crossings growth differed in traditional rearing which may reflect a genotype-environment interaction. Behavioral data highlighted that enriched-reared fish were slower to explore a new environment but more individuals engaged on doing so than traditional-reared fish. Results also showed that survival was high (>80 %) during all the trial. However, survival was lower during the second month in enriched environment. Our findings advocate for the integration of enriched rearing practices within the juvenile production for release in order to boost the performance linked to fitness. Stocking practices and life history research must work together to favor adaptive aquaculture approaches, which support species conservation.

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Hatchery stock enhancement and conservation of sturgeon, with an emphasis on the Azov Sea populations

Cited by 51 publications

References 5 publications

Molecular analysis of phylogeographic subspecies in three Ponto-Caspian sturgeon species

Molecular analysis of phylogeographic subspecies in three Ponto-Caspian sturgeon species

Dietary zinc requirement of Siberian sturgeon (Acipenser baerii, Brandt 1869) juveniles, based on the growth performance and blood parameters

European sturgeon (Acipenser sturio L.) young of the year performance in different rearing environments –study within a stocking program

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