Effect of rainbow trout size on response to rotenone and antimycin

North American Journal of Fisheries Management
By: , and 



The piscicides rotenone and antimycin are commonly used to eradicate unwanted fish populations. However, the relationships (if present) between their toxicities and fish sizes are unknown and could be especially important when bioassay fish are used to detect piscicide presence and effectiveness. Size-mediated toxicity could lead to either excessive or inadequate piscicide applications if bioassay fish are larger or smaller than the fish being eradicated. The relationships between time to death and weight of rainbow trout Oncorhynchus mykiss (0.7–574.0 g) at an antimycin concentration of 7.5 μg/L and a rotenone concentration of 12.5 μg/L were determined. Antimycin took significantly longer than rotenone to kill rainbow trout at concentrations typically used in eradication projects. Significant positive relationships existed between fish size and time to death for rotenone and antimycin exposures and were probably caused by size-mediated differences in metabolic rate; however, these relationships accounted for less than 21% of the variation in time to death. Smaller fish appeared to be affected by the chemicals more quickly, but their deaths did not consistently occur before the deaths of larger fish.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Effect of rainbow trout size on response to rotenone and antimycin
Series title North American Journal of Fisheries Management
DOI 10.1080/02755947.2011.646456
Volume 31
Issue 6
Year Published 2011
Language English
Publisher Taylor and Francis
Publisher location Philadelphia, PA
Contributing office(s) Montana Cooperative Fishery Research Unit
Description 7 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title North American Journal of Fisheries Management
First page 1146
Last page 1152
Country United States
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