Optimizing the gonadoliberin dosage and evaluating the egg quality in the preseason and seasonal artificial reproduction of pond-reared sterlet Acipenser ruthenus

Ljubobratović, Uroš; Bogár, Katalin; Káldy, Jen; Fazekas, Georgina; Vass, Norbert; Feledi, Tibor; Kovács, Gyula

doi:10.1016/j.anireprosci.2022.107097

Cited by 3 publications

(1 citation statement)

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“…The living gene bank boasts ten separate generations, including six mature generations (the oldest stock dates back to 2008) and four juvenile generations. As a result of periodic artificial propagation [15,16], the size of the sterlet broodstock in the gene bank currently exceeds 200 sexually mature specimens. Mature individuals are labelled with Passive Integrated Transponder (PIT) tags, which allow us to identify the individuals and link them with genotype and phenotype data among other information for each examined fish (age, metric characteristics, egg/sperm quality from previous seasons' propagation).…”

Section: Introductionmentioning

confidence: 99%

Genetic Characterization of Endangered Sterlet (Acipenser ruthenus, Linnaeus 1758) Gene Bank Broodstock, Natural and Cultured Populations in Hungary

Fazekas,

Kovács,

Sándor

et al. 2024

Fishes

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The sterlet (Acipenser ruthenus) is the smallest-bodied endangered species among the six native sturgeon species of the Danube River, and self-sustaining populations still inhabit the Hungarian section of the Danube River and its largest tributary, the Tisza River. Their populations are drastically decreasing; however, they still have natural reproduction in these habitats. For the genetic conservation of the species, an ex situ gene bank is maintained in Hungary. The present study aimed to analyze the genetic resources of a gene bank with a near 40-year history and to compare it with natural populations and farmed stocks. Twelve microsatellites were used for population genetics analyses and individual genotyping of 268 specimens from two natural habitats (Danube and Tisza Rivers) and three captive stocks (a gene bank broodstock and two farms). Microsatellites revealed similar patterns among wild populations and gene bank stocks and did not show genetic differentiation (FST: 0.016–0.017) among them. These results confirmed that the gene bank broodstock properly represents the genetic background of the Danube and Tisza populations and is suitable as a source of breeding materials for the restocking programs. Negative trends were detected in the farmed stocks, reflected in reduced polymorphism at a few loci. The results of the principal component analyses indicate the farm stocks’ separation from the wild and gene bank stocks. The present genetic characterization study reveals a valuable captive stock of the endangered sterlet populations and provides unique information about the genetic similarities and differences among farms and wild stocks in Hungary. Our results provide information that contributes to preserving the genetic structure and variability in sterlet populations and supports the management of gene bank broodstock—avoiding inbreeding and preserving the unique genetic background of the Carpathian basin.

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Section: Introductionmentioning

confidence: 99%