A Study On The Biochemistry Of Alarm Substances In Fish

Two cyprinid fishes, rlinostomus funduloides and Notropis cornutus were tested with naturally occurring substances including some well-known biogenic amines. Behavioral responses to histamine were similar to those observed in previous tests with natural alarm substance extracts. A response threshold was obtained at 0.01 ppm. Spectrophotofluorometric emission spectra also indicated that the natural alarm substance known to exist in many species of fish may be a ringed or double ringed compound.

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