Abstract
From 1912 to 1954 inclusive, more than 200 million pounds of rough fish have been removed from Wisconsin waters. The major part of this total was carp (Cyprinus carpio). Analysis of the catch reports for some of the more heavily fished and more productive waters show the importance of strong year classes in the fishery (Hacker, 1952a, 1952b; Helm, 1951; Threinen, 1952). A tabulation of the size frequency of carp in the catch indicated that as much as 80 per cent of the catch were of one year class. In some instances this year class could be easily traced through a fishery for several years.
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