Acute avoidance reactions and behavioral responses of juvenile rainbow trout oncorhynchus mykiss to garlon 4 garlon 3a and vision herbicides

Morgan, J.D.; Vigers, G.A.; Farrell, A.P.; Janz, D.M.; Manville, J.F.

Environmental Toxicology and Chemistry 10(1): 73-80

1991


ISSN/ISBN: 0730-7268
DOI: 10.1002/etc.5620100109
Accession: 006984844

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Abstract
Laboratory bioassay experiments were conducted with juvenile rainbow trout (Oncorhynchus mykiss) to determine the acute lethal (96-h LC50) values of the forest-use herbicides Garlon 3A, Garlon 4, and Vision with 15% and 10% surfactant formulations, and the thresholds concentrations of these herbicides that would cause behavioral effects. A Y-maze apparatus was used to determine the threshold concentration of each herbicide that elicited either an avoidance or a preference reaction from rainbow trout fry after a one-hour exposure period. Rainbow trout fry were observed for qualitative behavioral changes (e.g., increased coughing and ventilatory rates, loss of equilibrium etc.) over a four-day period of exposure to a wide range of chemical strengths. Nominal concentrations of the herbicides eliciting threshold avoidance reactions in test fish were 150 ppm Vision-10% surfactant, 54 ppm Vision-15% surfactant, 19.2 ppm Garlon 4, and 800 ppm Garlon 3A, which were, respectively, 2, 2, 8, and 2 times the 96-h LC50 values determined for each herbicide. Preferential reactions to the herbicide solutions were not observed. Qualitative behavioral changes were observed in rainbow trout fry at levels from 25% (Garlon 4) to 50% (Garlon 3A, Vision-10% and -15% surfactants) of the 96-h LC50 values. Nominal concentrations of the herbicides causing threshold changes in fish behavior were 37.5 ppm Vision-10% surfactant, 13.5 ppm Vision-15% surfactant, 0.60 ppm Garlon 4, and 200 ppm Garlon 3A.

Acute avoidance reactions and behavioral responses of juvenile rainbow trout oncorhynchus mykiss to garlon 4 garlon 3a and vision herbicides