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Electrical responses to 17 amino acids, taurine, betaine, acetic acid and HCI were recorded from the ramus buccalis wich innervates pit organs on the snout region of the carp. In the whole merve responses, L-glutamic acid and L-aspartic acid which belong to the group of the acidic amino acid elicited marked excitatory responses. Their threshold was estimated to be between 10-6M and 5×10-6M and was as low as that of HCI or acetic acid. Neutral amino acids except L-proline also induced excitatory responses, while their thresholds were 2-3 log units higher than those of the acidc amino acids. When the stimulus intensity was sufflciently high, the response was composed of two phases, the phasic and tonic phase. The stimulation with basic amino acids caused an inhibition of the spontaneous discharges. The inhibitory effect of L-arginine could be transformed into the excitatory when the pH was modified to 7.0. High dependence of the response uponth the pH was suggested. In twenty-seven fibers, responses to seven amino acids and HCI were recorded. All the fibers responded to all the chemicals tested but no specific fiber was found. High correlation coefficients among the responses to the chemicals were obtained in all the fibers. These results suggest that the pit organs innervated by the r. buccalis can respond to various chemicals, but theylack the function to differentiate the chemicals.

Responses of the pit organ to amino acids in carp.