Abstract
This study documents the incidence of fin erosion and deformed (anomalous) fishes in two adjacent midwestern streams, north-central Ohio, U.S.A. Clear Fork stream flows through agricultural and forested areas, whereas Rocky Fork stream flows through industrialized Mansfield, Ohio, where it receives industrial and municipal effluents. Four sites on each stream were sampled monthly for fishes during July, 1982 through August, 1983. Incidence of fin erosion was significantly greater (P 0.05). Incidence of fin erosion in fish from polluted sites was inversely correlated with water temperature (P 0.05). Nevertheless, total incidence of deformed fishes at polluted sites (0.53%) seemed to be elevated compared to total incidence at unpolluted sites (0.28%). Comparative studies between fish from streams suspected of being polluted and fish from nearby unpolluted, reference streams should be used to define effects of chronic pollution.
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