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Free and total cortisol levels in semelparous and iteroparous chinook salmon
Author(s) -
Barry T. P.,
Unwin M. J.,
Malison J. A.,
Quinn T. P.
Publication year - 2001
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.1095-8649.2001.tb00230.x
Subject(s) - semelparity and iteroparity , biology , chinook wind , oncorhynchus , fishery , fish <actinopterygii> , zoology , ecology , life history
Total cortisol, free cortisol and percent free cortisol were all significantly higher in semelparous male chinook salmon Oncorhynchus tshawytscha than in iteroparous and immature fish. The findings suggest that the regulation of both total and free cortisol concentrations may play key roles in mediating the post‐spawning death of semelparous Pacific salmon.