Abstract
Abstract Ranking third in angler preference, walleye Stizostedion vitreum is one of the most important sport fish in Iowa, yet this species is rare in inland rivers. From 1986 through 1989, fry and fingerling walleyes were marked with coded wire tags and freeze brands, stocked in three Iowa rivers, sampled by seining, and electrophoretically analyzed to evaluate their survival 2–3 weeks after stocking. Two river strains and one lake strain of walleyes were stocked. Fall electroshocking provided annual survival and population estimates. No significant contribution resulted from stocked walleye fry; however, stocked fingerlings averaged 76% of young-of-year walleyes for each study reach, and they averaged more than 50% of the total populations. Actual fingerling contributions were 95–100%, but extensive tag loss prevented conclusive identification. Fingerling walleye growth was excellent initially, exceeding 20 cm the first year, but it decreased the following years under drought conditions and high populat...
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