Agonistic behaviour of wild eels and depressed survival and growth of farmed eels in mixed rearing experiments.

Autor: Wakiya R; Research and Development Initiative, Chuo University, Tokyo, Japan.; Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba, Japan., Itakura H; Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, Maryland, USA., Imayoshi Y; Fisheries Technology and Development Center, Kagoshima, Japan.; Kagoshima Prefecture Fisheries Promotion Section, Kagoshima, Japan., Kaifu K; Faculty of Law, Chuo University, Tokyo, Japan.; The Zoological Society of London, London, UK.
Jazyk: angličtina
Zdroj: Journal of fish biology [J Fish Biol] 2022 Jun; Vol. 100 (6), pp. 1365-1374. Date of Electronic Publication: 2022 Apr 27.
DOI: 10.1111/jfb.15047
Abstrakt: To contribute to improving eel stocking procedures, the survival, growth and behaviour of farmed Japanese eels reared together with wild individuals were evaluated to learn about possible encounters of farmed- and stocked eels with wild eels. Two experiments were conducted to evaluate the (a) effect of the presence of wild eels on survival and growth of farmed eels in experimental ponds and (b) behavioural differences between wild and farmed eels placed in a small tank. In the survival and growth experiment, significantly lower survival and growth rates of farmed eels reared with wild eels were observed compared with farmed eels reared without wild eels (control). In the behavioural observations, the authors observed significantly higher occupation rates of a refuge and more frequent biting for wild eels, indicating a dominance of wild eels over farmed eels. Because wild and farmed eels used in the current experiments belong to the same genetic population, these differences resulted within one generation through the aquaculture rearing process.
(© 2022 Fisheries Society of the British Isles.)
Databáze: MEDLINE
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