Olfactory Perception in Juvenile Salmon.: I. Observations on Response of Juvenile Sockeye to Extracts of Foods

Abstract

The introduction of aqueous extracts of natural foods into an aquarium holding juvenile sockeye evoked exploratory and feeding responses in fish that had previously eaten the foods, but failed to do so in fish that had not. Responses were characterized by breaking up of the school, increased swimming speeds, and the swimming of the fish into lighted areas. The fish detected concentrations of the active substance(s) in the order of one part in 80,000,000, based on the wet weight of the whole food.