Abstract
A matched-planting experiment was conducted to determine the most suitable salmonid genotype for stocking in former lake trout lakes that currently are too acidic to support lake trout reproduction. Hatchery-reared lake trout Salvelinus namaycush, brook trout Salvelinus fontinalis, and F1 splake S. namaycush × S. fontinalis were planted in May 1989 at age 18–19 months in four lakes with pH values of 4.9–5.4. Relative survival of the three genotypes was assessed during a 4-d holding period immediately after stocking and by gillnetting during the summer of 1990. During the 4-d holding period, survival of lake trout (23%) was significantly lower than that of brook trout (98%) and splake (92%). Gillnetting recovery rates were 0–0.9% for lake trout, 0–1.8% for brook trout, and 1.1–15.0% for splake. The results of this study suggest that splake are the most suitable of these three salmonid taxa for stocking on a put–grow–take basis in lakes of pH 4.9–5.4
Published Version
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