Factors contributing to high levels of plasma iodide in brook trout, Salvelinus fontinalis (Mitchill)

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Abstract
The influences of dietary iodine, ambient iodide, tissue storage of iodide, and iodide binding to plasma proteins have been related to the high plasma iodide in laboratory brook trout.Plasma iodide exceeded 1800 μg/100 ml (μg%) for trout acclimated at 13 °C and fed an Ewos commercial diet. This was largely due to (i) efficient iodide absorption from the gut, and (ii) an iodine concentration in Ewos food (31–35 μg I/g dry wt.) that was 20–78 times greater than that of four other artificial foods or that of several natural food items.Ambient iodide ranged seasonally from 1.26 to2.21 μg I/liter. This source probably contributed little to the high plasma iodide, but helped to maintain plasma levels during starvation or use of low-iodide diets.No major extrathyroidal iodide storage site was found in 15 organs or tissues examined.Iodide binds to brook trout plasma proteins, but the concentration of binding sites is less than that reported for other species. This binding aids maintenance of plasma iodide, particularly when iodide intake is low. Variation in plasma iodide between individual fish was not clearly related to variations in iodide–protein interactions nor to variations in plasma protein levels.

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