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Document Type

Research

Abstract

Even though the habitat is marginal, a considerable fishery exists for walleyes in the Des Moines River. Tagging studies indicate the annual rate of harvest to be about 10 percent. The size of the population is evidently limited by frequent fish kills due to high water temperatures in the summer and oxygen depletion in the winter. Considerable variation in growth exists within age groups and between year classes. Possible explanations include: (1) sexual differences, especially between fish over four years old; (2) frequent fish kills which result in vacancies in the habitat; (3) low water levels during certain years; and (4) frequent stocking of fry, fingerlings, and yearlings during different seasons. The growth and general well-being of Des Moines river walleyes are about average when compared with those in other parts of the country.

Publication Date

1959

Journal Title

Proceedings of the Iowa Academy of Science

Volume

66

Issue

1

First Page

523

Last Page

533

Copyright

© Copyright 1959 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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