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Two Methods for Evaluating Fingerling Walleye Stocking Success and Natural Year‐Class Densities in Seven Island Lake, Wisconsin, 1977‐1981
Author(s) -
Hauber Alan B.
Publication year - 1983
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8659(1983)3<152:tmfefw>2.0.co;2
Subject(s) - stizostedion , acre , stocking , electrofishing , fish <actinopterygii> , fishery , population , biology , agroforestry , demography , sociology
The contribution of stocked fingerling walleyes (Stizostedion vitreum vitreum) to the population of 138‐acre Seven Island Lake was investigated between 1977 and 1981. Population estimates of fingerling and yearling walleyes were evaluated, using both regression analysis based upon a single sample and catch per effort by electrofishing. Two stocked year classes of walleyes contained 2‐3 times as many fish at age 1+ as did three natural year classes. Maximum natural year‐class densities did not exceed 1.0 fish/acre at age 0+ or 1+. Population estimates of fingerling and yearling walleyes, using a single sample, were closely correlated with mark‐and‐recapture estimates. The mean estimated densities of fingerling and yearling walleyes were 0.8 fish/acre and 1.5 fish/acre, respectively, for the mark‐and‐recapture; 0.9 fish/acre and 1.7 fish/acre, respectively, from a single sample.