Abstract
Abstract The morphoedaphic index MEI (total dissolved solids in mg/liter divided by mean depth in meters), developed by Richard A. Ryder in the mid-1960s as an estimator of potential fish yield in lakes, can be used to predict both fish harvest and standing crop in United States reservoirs. The relation of reservoir sport-fish harvest to the index is curvilinear, with maximum yields expected at index values of 50 to 100. Fish standing crop in 290 reservoirs was also significantly correlated with the MEI; maximum crops would be expected at values of 50 to 200. Predictive value was increased when the sample was divided into four subsets on the basis of the reservoir operational type and water chemistry. The MEI-crop relationships were also curvilinear; predicted crops were highest in hydropower mainstream reservoirs and lowest in nonhydropower reservoirs where sulfate-chloride ions were dominant. Coefficients of determination in the subsets ranged from 0.47 to 0.72. The MEI should be of practical utility to...
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