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Fitness‐related effects of growth investment in brown trout under field and hatchery conditions
Author(s) -
Johnsson J. I.,
Jöusson E.,
Petersson E.,
Jäurvi T.,
Bjöurnsson B. Th.
Publication year - 2000
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2000.tb02175.x
Subject(s) - salmo , hatchery , biology , brown trout , trout , fishery , investment (military) , salmonidae , zoology , fish <actinopterygii> , ecology , politics , political science , law
The mortality of brown trout Salmo trutta over winter in a near‐natural stream was not significantly increased by growth hormone (GH) treatment, but lipid reserves were lower in GH‐treated fish. As GH‐treated trout grew faster than controls, GH appears to promote growth at the expense of investment in maintenance. However, the growth promoting effect of GH was much more pronounced in the hatchery than in the stream, suggesting that the pay‐off associated with increased growth investment is higher under hatchery conditions with unrestricted food supply than in wild, where food availability is limited.