Slower growth of farmed eels stocked into rivers with higher wild eel density.
Anguilla
Japanese eel
intraspecific competition
stocking
Journal
Journal of fish biology
ISSN: 1095-8649
Titre abrégé: J Fish Biol
Pays: England
ID NLM: 0214055
Informations de publication
Date de publication:
Sep 2022
Sep 2022
Historique:
received:
08
10
2021
accepted:
01
06
2022
pubmed:
10
6
2022
medline:
15
9
2022
entrez:
9
6
2022
Statut:
ppublish
Résumé
Farmed anguillid eels are frequently stocked into natural fresh waters to enhance eel resources, but little is known about what happens to these eels or their interactions with wild eels after stocking. A recent study observed a depressed survival and growth rate of farmed Japanese eels when they were reared with wild eels, which indicated that wild eels might interfere with the survival and growth of farmed-and-stocked eels through intraspecific competition. To contribute to improving eel stocking efficiency, the growth of farmed-and-stocked Japanese eels was compared among four rivers with different wild eel densities using mark-and-recapture studies. Based on the 2-year recapture survey after stocking, it was found that the density of the farmed-and-stocked eels was not significantly different among rivers. The daily growth rates of farmed-and-stocked eels in the rivers with lower wild eel density were significantly higher than those of the eels stocked into the rivers with higher wild eel density. The farmed-and-stocked eels moved significantly greater distances downstream than wild eels that showed sedentary behaviour. This and previous studies indicate that significant questions remain about the effectiveness of stocking farmed eels into water bodies where naturally recruited wild eels are present.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
613-627Subventions
Organisme : Core Research for Evolutional Science and Technology
ID : JPMJCR13A2
Organisme : Fisheries Agency
Organisme : Japan Society for the Promotion of Science
ID : JP19KK0292
Organisme : Japan Society for the Promotion of Science
ID : JP17H03735
Organisme : Japan Science and Technology Agency
Organisme : the Society
Organisme : Chuo University
Organisme : Fisheries Agency of Japan
Informations de copyright
© 2022 Fisheries Society of the British Isles.
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