Abstract
Wild migrating sockeye salmon Oncorhynchus nerka exposed to 20, 50 and 80 mg 1−1 of clove oil could be handled within 3 min, recovered within 10 min, and survived 15 min exposure trials. Fish tested at 110 mg 1−1 did not recover from 15 min exposure trials. Response curves developed for induction and recovery time considered the following predictors: clove oil concentration, sex, fish length and depth. A significant positive dependence was observed between induction time and fish length for 20, 50 and 80 mg 1−1 test concentrations; no dependence was observed between induction time and length at 110 and 140 mg 1−1. Recovery time differed as a function of clove oil concentration, but not fish size. A concentration of 50 mg 1−1 is recommended for anaesthetizing sockeye salmon ranging in length from 400 to 550 mm at water temperatures averaging 9–10° C.
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