Tanks used to expose small groups of cutthroat trout to control or carbaryl solutions prior to behavioral or acetylcholinesterase measurements.
In a joint effort with the U.S. Fish and Wildlife Service, we are investigating the effects of carbaryl on coastal cutthroat trout. Carbaryl is a neurotoxic insecticide that inhibits acetylcholinesterase, an enzyme that hydrolyzes the transmitter acetylcholine at neuronal and neuromuscular synapses. The pesticide is applied to tidelands in coastal estuaries of Washington State to control burrowing shrimp. The purpose of this study is to examine whether exposure to carbaryl may impair the nervous system and behavioral performance of cutthroat trout and increase the vulnerability of exposed animals to estuarine predators.
This project has the following specific objectives: 1) determine whether coastal cutthroat trout can detect and avoid carbaryl in seawater via the olfactory system; 2) determine the time course for acetylcholinesterase inhibition and recovery in trout exposed to carbaryl at environmentally-realistic concentrations; 3) evaluate the sublethal effects of carbaryl on swimming performance, and 4) evaluate the effects of carbaryl on the ability of trout to avoid a marine predator.
David Baldwin, Jana Labenia, Barb French and Nat Scholz
Jay Davis, US Fish & Wildlife Service
US Fish & Wildlife Service,
Environmental Contaminants Program
Swim chambers that force fish to swim against a regulated flow to measure the swimming or endurance ability of individual fish.
Davis, J.W., Baldwin, D.H., Labenia, J.S., French, B. and Scholz, N.L. (2004) Neurobehavioral effects of carbaryl on coastal cutthroat trout. Proceedings of the Society of Environmental Toxicology and Chemistry's 4th World Congress, Portland, OR. Oral presentation.
Davis, J.W., Labenia, J.S., Baldwin, D.H., French, B. and Scholz, N.L. (2003) Sublethal effects of the carbamate insecticide, carbaryl, on coastal cutthroat trout. Proceedings of the Society of Environmental Toxicology and Chemistry's 24th Annual Meeting, Austin, TX. Poster presentation.
Davis, J.W., Labenia, J.S., Baldwin, D.H., French, B. and Scholz, N.L. (2003). Sublethal effects of the carbamate insecticide, carbaryl, on coastal cutthroat trout. Proceedings of the Georgia Basin/Puget Sound Research Conference 2003, Vancouver, BC, Canada. Poster presentation.