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Cortisol Concentrations in Confined Juvenile Chinook Salmon (Oncorhynchus tshawytscha)
Author(s) -
Strange Richard J.,
Schreck Carl B.,
Ewing Richard D.
Publication year - 1978
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1978)107<812:ccicjc>2.0.co;2
Subject(s) - oncorhynchus , chinook wind , juvenile , basal (medicine) , zoology , fish <actinopterygii> , biology , medicine , plasma concentration , fight or flight response , endocrinology , fishery , smoltification , salmonidae , ecology , biochemistry , insulin , gene , salmo
Mean plasma cortisol concentration in juvenile chinook salmon increased from near zero to about 200 ng/ml in response to 0.5 h of severe confinement. Cortisol remained elevated for more than 6 h after release, but returned to basal levels within 12.5 h. In fish subjected to continuous severe confinement, plasma cortisol increased to about 400 ng/ml during the first 1.5 h; little further increase occurred, but by 12.5 h, mortality caused by the stress had reached 50%. In response to moderate confinement, plasma cortisol increased to different degrees in individual fish, but returned to basal levels within 6‐8 days as the fish acclimated to the stress. A depression in gill Na+K ATPase was noted in juvenile salmon after they were moderately confined for about 3 wk.