Abstract
Pellet implantation, immersion, or feeding of thyroxine (T4) raised plasma T4 levels above values of control fish (usually less than 1 μg/100 ml). Values for treated fish in the lower dosage groups generally fell between 1 and 4 μg/100 ml, while in the higher dosage groups plasma T4 levels ranged from 5 to 16 μg/100 ml.

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