The effect of olfactory deprivation on the thresholds of sensitivity of skin chemoreceptors of carp <Emphasis Type="Italic">Cyprinus carpio</Emphasis>

Using method of registration of electrical potentials caused by chemical stimulation of the skin surface of the head of the carp Cyprinus carpio, the effect of prolonged olfactory deprivation (3, 9, and 12 months after operation) and partial blinding of anosmiated fish (9 months) on the sensitivity thresholds of external chemoreceptors was studied. It was found that, 3 months following anosmiation, the thresholds decreased by orders of 0.1–0.5, and, after 9 and 12 months, they decreased by orders of 0.1–0.8 depending on the kind of the chemical stimulus and the zone of registration. The highest increase in the sensitivity of skin chemoreceptors was recorded in anosmiated fish deprived also of object vision, by orders of 0.3–1.5. The results obtained indicate the existence of a close functional relationship between the olfactory and visual systems, on the one hand, and the skin chemosensory system, on the other hand. The compensatory processes taking place in these systems in the case of the loss of one of them have an adaptive pattern and are directed at provision of reliability of behavioral contacts and survival of fish in the environment.