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Initial attempts to measure -MSH in trout blood by radioimmunoassay proved unsuccessful due to apparent losses of immunoreactive hormone, especially in the plasma of trout adapted to a black background. An extraction protocol for -MSH from plasma is described. Subsequent radioimmunoassay revealed progressive increases in immunoreactive -MSH as trout became adapted to a black background. Plasma -MSH titres were raised during fungal infection, and also showed significant differences in fish obtained from different fish farms.