Year-class analysis of walleye, Stizostedion v. vitreum (Mitchill), taken by anglers in a portion of the Cedar River in Iowa indicated that alternate-year stocking of 3,500 fry per mile of river did not influence year-class abundance. Despite the short duration of the project, 1951-1958, a reasonably direct relationship between spring floods and spring air temperatures and year-class abundance was evident. Disparity in year-class abundance between samples taken 5 miles apart and within 3 months of each other, but by different methods (angling and chemical kill), indicates either a sampling selectivity or a relative discreteness or stability of portions of an assumed homogeneous population of river walleyes, or both.
Proceedings of the Iowa Academy of Science
©1961 Iowa Academy of Science, Inc.
Clearly, R. E. and Mayhew, J. K.
"An Analysis of an Alternate-Year Walleye Fry Stocking Program in the Cedar River in Iowa,"
Proceedings of the Iowa Academy of Science, 68(1), 254-259.
Available at: https://scholarworks.uni.edu/pias/vol68/iss1/38