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Freshwater Drum, Aplodinotus grunniens, in the Navigational Impoundments of the Upper Mississippi River
Author(s) -
Butler Robert L.
Publication year - 1965
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1965)94[339:fdagit]2.0.co;2
Subject(s) - drum , fishery , fishing , hydrology (agriculture) , environmental science , fish <actinopterygii> , geography , oceanography , geology , biology , archaeology , geotechnical engineering
Scale samples from fish taken during the years of 1944 through 1948 were used to analyze the freshwater drum fishery of the Upper Mississippi. Total and fishing mortality rates were calculated for heavily and lightly fished populations in the impoundment system of 26 dams. Mortality rates of drum from the northern section of the river were compared with those from the southern section. Weak year classes were formed during 1942, 1943, and 1945, and strong year classes were formed during 1941 and 1944. Strength of year class was directly related to air and water temperature during May but not to water stage during the spawning season.