Differences in Early Development Among Lake Trout (Salvelinus namaycush) Populations

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Abstract
Genetic differences among surviving lake trout (S. namacycush) populations might be important for the reestablishment of self-sustaining populations in the Great Lakes [USA], but little relevant information is available to guide stocking practices. Eggs and fry of 4 populations were studied, 2 from Lake Superior, 1 from Trout Lake, and 1 (the Green Lake strain) derived in part from Lake Michigan. Significant interpopulation differences were found in hatching and emergence times as well as in indices of morphological development rates. Interpopulation differences in morphological development at the times of emergence suggest that the Green Lake strain emerges at an earlier stage of morphological development than do the other populations. Between-lake differences are the most important sources of variability in the data; the Lake Superior populations were similar to one another, and variation among crosses within populations was small.

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