[The ultrastructural characteristics of olfactory receptor cells with different levels of sensitivity].

Structural and functional properties of the animals olfactory analyzer were studied on different stages of their life. Attention was drawn to defining the correlations between the ultrastructure of primary sensory cells, their sensitivity and realization of adaptive behavior in fish in diverse reproductive period stages. Structural organization in fish olfactory cells appearing during spawning aim both to activate these cells to provide specific receptor function during intercourse and to urgently abolish it when transitioning to paternal behaviour. Not only central mechanisms of nervous system but also reorganizations of peripheral chemoreceptive apparatus are of great importance, which is demonstrated for the first time.