Utilization of Selective Removal of Grass Carp (Ctenopharyngodon idella) from an 80-Hectare Florida Lake to Obtain a Population Estimate

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Abstract
Selective removal of grass carp was attempted in an 80‐hectare Florida lake by means of a 0.1‐mg/liter treatment of rotenone. A mark‐recapture procedure was used to obtain a population estimate. Prior to the lake treatment, a field bioassay conducted in large polyethylene bags containing lake water and suspended in the lake, revealed that a 0.1‐mg/liter concentration of rotenone killed grass carp but had little effect on sport fish. Fish collected from block nets set within the lake revealed lake‐wide rotenone treatment removed more than half of the threadfin shad (Dorosoma petenense), grass carp, and golden shiners less than 100 mm. Appreciable numbers (20‐50%) of largemouth bass (Micropterus salmoides), lake chubsuckers (Erimyzon sucetta), larger golden shiners, and redear sunfish (Lepomis microlophus) less than 100 mm were affected. Larger redear sunfish, bluegill (Lepomis macrochirus), warmouth (Lepomis gulosus), and black crappie (Pomoxis nigromaculatus) were abundant within the lake, as shown by quantitative block net sampling; however, their mortality from the selective treatment was less than 20% for all size classes.

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