[Morphofunctional characteristics of the Leydig cells in the testes of the humpback salmon Oncorhynchus gorbuscha during spawning migration].
By means of electron microscopic study of ultrastructure of Leydig cells of male adult humpback salmons in the period of spawning migration (stages III-IV of gonad maturity) they were found to be most active before the spawning. Maximum number of mitochondria with tubulovesicular crysts and normal development of Golgi apparatus and smooth endoplasmic reticulum were marked in this period. Decrease of mitochondria number and Golgi apparatus dictyosomes so as liposome-like bodies appearance in the cytoplasm indicated reduction of Leydig cells activity in the period of spawning. After this period fatty drops were presented in the Leydig cells cytoplasm, mitochondrial matrix acquired greater electron density and dark granules appeared in it. Signs of physiological regeneration outset were seen in dying male salmons. This is regarded as an evidence of secondary monocyclicity of the Pacific Ocean salmons.
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D000818:Animals; D003593:Cytoplasm / Q000502:physiology / Q000648:ultrastructure; D007985:Leydig Cells / Q000502:physiology / Q000648:ultrastructure*; D008297:Male; D008854:Microscopy, Electron; D012474:Salmon / Q000033:anatomy & histology* / Q000502:physiology