Effects of temperature on plasma thyroxine and lodide kinetics in rainbow trout, Salmo gairdneri

Plasma levels of thyroxine (T4) and iodide and their plasma kinetics were studied in fed immature rainbow trout maintained at 11° and then held for up to 14 d (days) at 5, 11, or 19°. Elevation (5°) or depression (19°) of plasma T4 occurred during the first 3 d following abrupt transfer from 11°, but by 7 and 14 d plasma T4 did not differ markedly between the three temperatures. In contrast, the T4 plasma degradation rate increased fourfold …