Identification of iodoamino acids in the plasma and bile of brook trout, Salvelinus fontinalis (Mitchill)

Abstract

Thyroxine was the main labelled iodocompound consistently detected by thin-layer chromatography in plasma and bile of starved TSH (thyroid-stimulating hormone) - treated brook trout previously injected with radioiodide. Failure to detect 3,5,3′-triiodo-L-thyronine and iodotyrosines contrasts with results of the few previous studies on circulating iodocompounds in teleosts.No labelled iodoamino acids were detected in plasma of trout held under a variety of conditions but not treated with TSH.