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Behavioral indicators of sublethal toxicity in rainbow trout
E E Little1, R D Archeski, B A Flerov
1U.S. Fish and Wildlife Service, National Fisheries Contaminant Research Center, Columbia, Missouri 65201.
Summary
Behavioral changes in rainbow trout indicate sublethal toxicity from agricultural chemicals. Effects varied by chemical, with feeding behavior most impacted by DEF, 2,4-DMA, and methyl parathion.
Area of Science:
- Environmental Toxicology
- Aquatic Toxicology
- Ecotoxicology
Background:
- Sublethal toxicity assessment is crucial for understanding environmental impacts of agricultural chemicals.
- Behavioral endpoints offer sensitive indicators of chemical stress in aquatic organisms.
Purpose of the Study:
- To evaluate four behavioral measures (spontaneous swimming activity, swimming capacity, feeding behavior, predation vulnerability) as indicators of sublethal toxicity in rainbow trout.
- To assess the effects of six agricultural chemicals on these behaviors.
Main Methods:
- Rainbow trout (Oncorhynchus mykiss) were exposed for 96 hours to sublethal concentrations of carbaryl, chlordane, 2,4-DMA, DEF, methyl parathion, and pentachlorophenol.
- Behavioral responses including spontaneous swimming, swimming capacity, feeding, and predation vulnerability were measured.
Main Results:
- Behavioral changes consistently indicated sublethal toxicity, with specific effects varying by contaminant and concentration.
- Feeding behavior was most inhibited by DEF, 2,4-DMA, and methyl parathion.
- Predation vulnerability increased most with carbaryl and pentachlorophenol exposure.
Conclusions:
- Behavioral assays are effective indicators of sublethal toxicity in rainbow trout exposed to agricultural chemicals.
- Different chemicals elicit distinct behavioral responses, highlighting the need for contaminant-specific risk assessments.