| Autor: |
Avramović Mladen, Turek Jan, Tomčala Aleš, Mráz Jan, Bláha Martin, Let Marek, Szmyt Mariusz, Randák Tomáš |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Knowledge and Management of Aquatic Ecosystems, Vol 0, Iss 425, p 10 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1961-9502 |
| DOI: |
10.1051/kmae/2024008 |
| Popis: |
This study investigated how 2+-year-old stocked pond-reared European graylings (Thymallus thymallus) acclimatised to a wild environment during six months (May–October 2019) after released. We examined the quantity and composition of lipids in the liver, muscles and visceral adipose tissues (VAT), as well as size parameters, condition factors and stomach contents. Our results showed a low post-stocking recapture rate (5.17%) of stocked fish after 6 months suggesting a poor acclimation to the wild environment. During the six months of monitoring, stocked fishes exhibited a sharp decrease in lipid content in all examined tissues, and, in the final month, lipid content was well below those of wild conspecifics. Stocked graylings preferred risky foraging behaviour and consumed numerous small drift preys with occasional hyperphagic events, thus experiencing strong bioenergetic challenges. Our study reveals that fish cultivated for extended periods struggle to acclimatise to the wild environment and that this commonly used stocking practice seems unsuccessful when aimed at strengthening wild grayling populations. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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