Is it possible to contribute to the recovery of European grayling (Thymallus thymallus, Salmonidae) populations by stocking cultured brood fish in the pre-spawning period?

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12520%2F25%3A43909720" target="_blank" >RIV/60076658:12520/25:43909720 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1111/jfb.16071" target="_blank" >https://doi.org/10.1111/jfb.16071</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1111/jfb.16071" target="_blank" >10.1111/jfb.16071</a>

Result language
angličtina
Original language name
Is it possible to contribute to the recovery of European grayling (Thymallus thymallus, Salmonidae) populations by stocking cultured brood fish in the pre-spawning period?
Original language description
European grayling populations have declined significantly in their central range, prompting numerous stocking programs with reared fish that did not bring desirable population prosperity. This study evaluated the effectiveness of stocking long-reared grayling brood fish before their spawning period. It focused on monitoring the presence of juveniles coming from their natural spawn in the stream and on recapture rates and growth parameters of stocked fish to estimate their adaptability in a natural river environment. The results revealed that the recapture rate of the stocked brood fish was notably low, with significant increases only in length growth but a decreases in condition factor, suggesting poor adaptability in the wild. The limited number of young-of-year grayling from natural spawning further indicated low reproductive success. These results highlight the inadequacies of this stocking approach to strengthen the wild grayling population. We suggest alternative strategies, such as using younger stock and implementing protective measures like catch-and-release, which may improve conservation efforts and enhance the success of grayling stocking programs.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10618 - Ecology

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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