title: Changes in plasma cortisol during stress and smoltification in coho salmon, Oncorhynchus kisutch.
abstract: The cortisol stress response in juvenile coho salmon, Oncorhynchus kisutch, considered as the difference between resting and peak poststress cortisol levels, increased from 80 ng/ml in March to 166 ng/ml in July, the period when smoltification normally occurs. Resting plasma cortisol levels also continually increased from 4 ng/ml in March to a maximum of 39 ng/ml in May, but then declined again to 3 ng/ml in July. The results indicate that there is an increased interrenal responsiveness to stress during the period of smoltification in coho salmon.
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D005618:Fresh Water; D005880:Gills / Q000201:enzymology; D006854:Hydrocortisone / Q000097:blood*; D012146:Rest; D012474:Salmon / Q000097:blood / Q000254:growth & development / Q000502:physiology*; D012623:Seawater; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism*; D013312:Stress, Physiological / Q000097:blood*; D013974:Thyroxine / Q000097:blood
chemical_list: D000254:Sodium-Potassium-Exchanging ATPase; D013974:Thyroxine; D006854:Hydrocortisone