Sea‐ranching of brown trout,Salmo truttaL.
作者:
N. JONSSON,
B. JONSSON,
L.P. HANSEN,
期刊:
Fisheries Management and Ecology
(WILEY Available online 1994)
卷期:
Volume 1,
issue 1
页码: 67-76
ISSN:0969-997X
年代: 1994
DOI:10.1111/j.1365-2400.1970.tb00007.x
出版商: Blackwell Publishing Ltd
关键词: ranching;trout;yield
数据来源: WILEY
摘要:
Abstract In total, 8211 1‐year‐old and 14839 2‐year‐old hatchery‐reared brown trout,Salmo truttaL., from 11 stocks were released at the mouth of the River Imsa, southwestern Norway. The recapture rates and total estimated yield were higher for 2‐ than 1‐year‐old trout, although recapture rates varied between years of release and stocks. The recapture rate increased with mean individual weight at time of release. Total estimated yield from the individual groups of 1+ trout ranged from 2 to 20 kg per 1000 trout released and for 2+ trout between 11 and 250 kg per 1000 fish released. In all cases, yields were lower than the economic break‐even yield. Most fish were recaptured the year of release (89.2% of 2+ and 76.2% of 1+ trout). Almost 31% of the recaptures were caught at sea and 69% in fresh water; 95.8% of the latter were taken in
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