2-Phenoxyethanol as a General Anaesthetic for Sockeye Salmon

Abstract
The dose-response relationship of 2-phenoxyethanol, as a general anaesthetic, in adult sockeye salmon (Oncorhynchus nerka) has been investigated. At 11[degree]C the effective dose (ED50) and lethal dose (LD50) were approximately 43 and 130 ml/100 Imperial gal, respectively. The (LD50) therapeutic ratio [image] was more than 3, indicating a good margin of safety. At a lowered aquarium temperature of 4[degree]C the anaesthetic effects of 2-phenoxyethanol were potentiated. ED50 and LD50 at this temperature were approximately 25 and 130 ml/100 gal of water, respectively. The therapeutic ratio was more than 5, indicating that the margin of safety was increased by the decrease in temperature.

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