Distribution of cortisol among its free and protein-bound fractions in rainbow trout (Oncorhynchus mykiss): evidence of control by sexual maturation.
1. Total cortisol concentrations did not differ in sexually matured female, male, and immature rainbow trout. 2. The per cent cortisol bound to a corticosteroid binding protein was greater in mature female fish (48.2%) than in mature male (16.0%) and immature fish (19.5%). 3. The mature female fish exhibited a lower percentage of free cortisol (21.8%) compared to mature males (44.8%) and immature fish (43.2%). 4. Parallel aspects of the teleostean cortisol binding-protein and the mammalian counterpart are compared and commented upon.
Caldwell
C A
CA
Department of Forestry, Wildlife, and Fisheries, University of Tennessee, Knoxville 37901.
Kattesh
H G
HG
Strange
R J
RJ
D000818:Animals; D005260:Female; D006854:Hydrocortisone / Q000378:metabolism*; D008297:Male; D011506:Proteins / Q000378:metabolism; D012741:Sexual Maturation; D014337:Trout / Q000378:metabolism*
D011506:Proteins; D006854:Hydrocortisone