ABSTRACT.Studies were conducted to determine the distribution of fish in the New and East Rivers in relation to thermal discharges from Appalachian Power Company's fossil fuel plant at Glen Lyn, Virginia. Over 15,300 specimens representing 41 species were collected with seines, electrogear and rotenone at six sampling locations from February, 1973 to October 1973. Sampling frequency was designed to evaluate the effects of ambient temperature upon preferred temperature. Diversity indices were calculated for each location. There was a slight decrease in the diversity indices for those stations located in the thermal discharge. Condition coefficients calculated forNotropis albeolusJordan,Notropis rubellusAqasaiz,Notropis spilopterusCope,Ictalurus punctatusRafinesque, andEtheostoma blennioidesRafuesque were found to be significantly (p =.05) lower in the thermal discharge for all species tested exceptE. blennioides. Temperatures were plotted against frequency of capture to determine a particular species temperature selection from field data and indicated that: (1) Some species avoided high temperatures (i.e.,Curnpostoma anomalumRafuesque). (2) Some species were attracted to high temperatures (i.e.,Ictalurus punctatus). (3) Some species distribution was not effected by temperatures (i.e.,Notropis spilopterus).
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