Most all research on life histories of fish in which age and growth are considered is based on the theory that annual rings are formed on the scales which can be counted to determine age, and that scale diameters increase proportionately with the length of the fish which permits the calculation of growth for each year of life. In the spring of 1947 a total of 556 adult yellow pikeperch, Stizostedion v. vitreum (Mitchill), commonly known as the walleye, was taken from State hatchery operated gill-nets, tagged and released in Spirit Lake as a part of a population appraisal (Rose, 1948). Scale samples, weights and measurements were taken from 252 of these fish for later analysis. In addition to these, scale samples were taken from 88 walleyes collected in 1946, 1948 and 1950 to obtain data on small and large adult size groups. From the examination of these scales and the length and weight data, an evaluation of the age and growth has been made which provides a practical basis for comparison with similar published material.
Proceedings of the Iowa Academy of Science
© Copyright 1951 by the Iowa Academy of Science, Inc.
Rose, Earl T.
"Notes on the Age and Growth of Spirit Lake Yellow Pikeperch (Stizostedion V. Vitreum),"
Proceedings of the Iowa Academy of Science: Vol. 58:
, Article 67.
Available at: https://scholarworks.uni.edu/pias/vol58/iss1/67