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The functional organization of the olfactory organ in macro somatic and micro somatic fish

, : The functional organization of the olfactory organ in macro somatic and micro somatic fish. Voprosy Ikhtiologii 17(3): 493-502

The functional structure of the olfactory system was determined in fish of differing olfactory capabilities. Bioelectric activity in the secondary pathways of the olfactory system was recorded in the sheatfish (Silurus glanis), pike (Esox lucius) and tench (Tinca tinca). In all 3 species the olfactory organ was a slowly adapting system, in which the response to odors depended on the species of fish and its functional state rather than the type of stimulation, although the intensity of the response correlated to the type of stimulation and its dosage. Enhanced sensitivity to natural odorants was observed in all species, while macro- and microsomatic fish differed in the spectra of perceptible stimuli, character of background and induced activity, relationship to the mechanical component of the stimulus and rate of adaptation and exhaustion. Microsomal fish exhibited sensitization of the organ under the effects of small doses of natural stimulation.

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