Abstract
Abstract Life histories of the golden redhorse (Moxostoma erythrurum), northern redhorse (M. macrolepidotum), and silver redhorse (M. anisurum) were studied on the Des Moines River in central Iowa. Adult golden redhorse are widely distributed within the study area; silver redhorse and young golden redhorse are primarily in areas where the current is slower; northern redhorse are generally present in fast-moving water. Redhorse populations are sedentary in the summer as judged from the movements of 1,642 fin-clipped redhorses. Length conversion factors and body-scale relationships are given for each species. Weight increased as the total length raised to the 3.0207 power in northern, 3.0980 power in golden, and 3.1243 power in silver redhorse. Coefficients of condition (CTL) averaged 36.0 for northern, 38.9 for golden, and 40.4 for silver redhorse, but showed definite seasonal trends with lows following spawning and increases during the summer and fall. There appeared to be no reason to doubt the validity ...
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