Abstract
Abstract Golden shiners (Notemigonus crysoleucas) generally reinrested Ball Pond, New Fairfield, Connecticut in greater numbers after each of six successive rotenone reclamations carried out from 1957 to 1974. To determine if Ball Pond golden shiners had developed resistance to rotenone, paired bioassays were completed with golden shiners from Ball Pond and from seven comparison ponds. Based on tolerance ratios, Ball Pond golden shiners were 4.0–7.1 times more tolerant of synergized and unsynergized formulations of rotenone than were golden shiners from unreclaimed ponds. Fish from Ball Pond were only 2.4 times more tolerant of synergized rotenone than were golden shiners from a pond reclaimed once with synergized rotenone in 1974. Golden shiners from comparison ponds also succumbed earlier to the effects of both rotenone formulations than did fish from Ball Pond. These findings suggest that Ball Pond golden shiners developed increased resistance to rotenone through the selective forces of reclamation.
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