抄録
The olfactory responses to amino acids, fatty acids and alcohols were studied by recording electro-encephalogram (EEG) from the olfactory bulb of the yellowtail, Seriola quinqueradiata, which is a marine active swimming fish. A comparison of the olfactory spectrum for 18 kinds of amino acids of the yellowtail with that of the red seabream, Pargus major revealed a high similarity of spectra. The threshold concentration for L-glutamine was 10-7 M, while those for fatty acids and alcohols were higher (10-3 to 10-2 M). The range of the stimulus concentration of response to amino acids was wider (5 to 6 log units) than that to fatty acids and alcohols (about 2 log units). The initial deflection and the inhibitory effects in the EEGs responded to fatty acids and alcohols, respectively. The results suggest that yellowtail use both vision and olfaction to locate their prey.
