Providing evidence to improve practice

Individual study: A field evaluation of a trap for invasive American bullfrogs

Published source details

Snow N.P. & Witmer G.W. (2011) A field evaluation of a trap for invasive American bullfrogs. Pacific Conservation Biology, 17, 285-291


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

American bullfrog control: Direct removal of adults Control of Freshwater Invasive Species

One small study in 2008 and 2009 in Colorado, USA (Snow & Witmer 2011) found that bullfrog adults were captured overnight in a single trap floating on the water surface, but that shoreline trapping was relatively unsuccessful. Shoreline trapping only captured one bullfrog across two ponds, each with two traps, in 10 total trap nights in 2008.  However, two floating traps placed in a third pond in 2009 captured 18 bullfrogs in 10 trap nights.  Thirteen additional bullfrogs were removed by hand netting.  All attractants trialled captured bullfrogs, and the rate of capture did not differ among types.  In all ponds, two traps were tested, each 69 × 69 × 25 cm and constructed with 1.3 × 1.3 cm wire mesh.  In 2009, the traps were modified so they floated by attaching Styrofoam flotation devices to the underside of the traps.  A range of attractants were added to the traps, including lights, live crickets, and fishing lures, with various combinations of attractants tested for one to four nights.