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Methods to Reduce Stress and Improve Over-winter Survival of Stocked Walleye Fingerlings

Document format: pdf

Publisher: Minnesota Department of Natural Resources

Creation date: 2001

We evaluated stress and over-winter survival of walleye fingerlings during normal Minnesota harvest and stocking procedures. Blood chemistry showed walleye fingerlings were stressed during each stage of the process. Blood plasma cortisol generally returned to baseline levels after 24 hours, but blood plasma chloride did not. Over-winter survival of stocked walleye fingerlings ranged from 1 percent to 63 percent in three lakes where stocked fingerlings averaged about 140 mm, but survival was 99 percent in one trial where stocked fingerlings averaged 192 mm. Holding fingerlings in a crib in the lake for 24 hr prior to release did not improve over-winter survival. However, hauling fingerlings at a density of 0.06 kg/l (0.5 lb/gal) rather than 0.12 kg/l (1.0 lb/gal) did appear to improve over-winter survival.

Key Words: Walleye • Handling Methods • Minnesota • Walleye Fingerlings • USA