L. L. Marking T.D. Bills 1988 <p><span>Crayfish have long been a nuisance in fishrearing ponds at fish hatcheries. The rusty crayfish (</span><i>Orconectes rusticus</i><span>) has displaced endemic species and caused serious declines of aquatic plants in some ponds and lakes in the midwestern USA. We attempted to evaluate the effect of intensive trapping on a crayfish population and to identify a selective chemical control agent and evaluate its effectiveness under field conditions. A crayfish population in a small pond was suppressed but not eliminated by trapping; adults were effectively harvested but efficiency diminished sharply as the population declined. Of 19 chemicals tested as possible control agents for crayfish, a synthetic pyrethroid (Baythroid) was by far the most toxic; 25 μg/L produced a complete kill of crayfish in the pond and was also the most selective for crayfish in laboratory tests.</span></p> application/pdf 10.1577/1548-8640(1988)050%3C0103:CONPOC%3E2.3.CO;2 en Oxford Academic Control of nuisance populations of crayfish with traps and toxicants article