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Tuesday, October 18 • 10:40am - 11:00am
Fisheries. Shoreline Rotenone Application to Control Largemouth Bass Recruitment in Small Impoundments

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AUTHORS: Matthew J. Catalano, Auburn University; Graves Lovell, Alabama Department of Conservation and Natural Resources

ABSTRACT: Controlling largemouth bass (Micropterus salmoides) recruitment to reduce their population density in small impoundments ( < 40 ha; hereafter “ponds”) is an important management challenge but is necessary to maintain desirable growth rates, body condition, and size structure in these populations. Recruitment of these populations is difficult to control directly because common gears (hook-and-line, electrofishing) for the mechanical removal of largemouth bass are inefficient at capturing age-0 fish. We evaluated the shoreline application of the piscicide rotenone to reduce age-0 largemouth bass density in five small impoundments in Alabama. Rotenone was applied twice at each pond, with treatments spaced two weeks apart in early to mid-June of 2015. Age-0 largemouth bass density was assessed via 15-ft seine hauls one day prior to and one day after rotenone application at treated ponds and also at nearby untreated control ponds. Reductions in age-0 largemouth bass seine catch rates averaged 69% and ranged from 41 – 94 % across ponds. Follow-up seine hauls two weeks post-treatment indicated that these reductions were still evident and had not been diminished by new recruitment of age-0 largemouth bass to the shoreline. Our findings suggest that shoreline rotenone has the potential to reduce age-0 largemouth bass density during summer shortly after recruitment to the littoral zone. However, more work is needed to assess whether these reductions give rise to lower recruitment to age-1 in these systems, and if the recruitment reductions are large enough to improve largemouth bass growth and condition.

Tuesday October 18, 2016 10:40am - 11:00am
Riverview A

Attendees (5)