Abstract
Abstract The effects of intermittent chlorination and temperature selection on the movement of fish were studied in an integrated field and laboratory project on the New River at the Glen Lyn Power Plant in southwestern Virginia. Over a temperature range of 7–36 C, the total number of fish sampled from the intermittently chlorinated thermal effluent was lower than control values (P ⩽ 0.09) when total residual chlorine (TRC) concentrations were ⩾ 0.15 mg/liter. After seasonal variations were segregated into discrete intervals of field temperature and fish avoidance of TRC, a decline in fish abundance in the chlorinated, heated discharge was observed within 95% confidence limits. In summer field temperatures of 27–30 C, fish avoided a TRC concentration that ranged from (95% confidence limits) 0.19 to 0.28 mg/liter TRC; when temperatures were falling from 26 to 7 C, they avoided 0.23–0.42 mg/liter TRC. The two most consistently sampled fish species, spotfin shiner Notropis spilopterus and whitetail shiner N....
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