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Citation:

This study was designed to develop a method to selectively remove triploid grass carp from lakes using Fish Management Bait (FMB), an oral rotenone bait. Preliminary tests in 1992-93 were conducted at the Florida Game and Fresh Water Fish Commission's Richloam Fish Hatchery and Lake Monterey (0.5 ha, Orange County). Initial applications of FMB were successful when water temperatures exceeded 23 C. Up to 79% of the triploid grass carp (total 131 fish) removed from hatchery ponds and 63% (30 fish) were removed from Lake Monterey. Secondary applications of FMB were much less effective and averaged removal of one fish per trial (total 19 fish). Ongoing tests in lakes ranging from 38 to 152 hectares began in 1993. In live Oak Lake (152 ha, Osceola County), 230 triploid grass carp (15% of the number stocked in 1988-89) were removed. In four other central Florida lakes, 112 triploid grass carp were removed. Removal of non-target fish with FMB was minimal and no effects on wildlife were observed. FMB showed promise as a practical tool for triploid grass carp population control.

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Citation:

Mallison, C.T., Hestand, R.S. III and B.Z. Thompson.  1995.  Removal of triploid grass carp with an oral rotenone bait in two central Florida lakes.  Lake and Reservoir Management 11(4): 337-342.

Abstract:

Fish Management Bait (FMB), a rotenone-laced feed pellet, was tested in two central Florida lakes to evaluate its effectiveness in removing triploid grass carp (Ctenopharyngodon idella). Initial trials of FMB were successful in removing 251 triploid grass carp (average nine/trial) at Live Oak Lake, 152 ha, and 110 (average five/trial) at Lake Whippoorwill, 132 ha. Retrials (secondary applications of FMB) were much less effective and removed 47 triploid grass carp (average one/trial) at Live Oak Lake and 31 (average one/trial) at Lake Whippoorwill. Effects on non-target fish were minimal (average one fish removed/seven trials) and no wildlife was visibly affected. FMB showed potential as an effective and selective method of triploid grass carp removal.