Коziy М. S.

Моrphofunctional Changes of the Liver of Russian Sturgeon in Early Postnatal Ontogenesis

About the author:

Коziy М. S.



Type of article:

Scentific article


The viability of young individuals is actual in the decision of the problem of preservation of valuable fish species. The period of transition to active exogenous feed determines the survivability and influences on the rate of population number. The change of histological structure of glands of digestive tract plays a crucial role in the metabolic transformation of food components. The histological monitoring is necessary to establish the morphological features of types and mechanisms of formation of separate organs and tissues. At the beginning of passing of larvae of the Russian sturgeon to the exogenous feeding the population of hepatocytes differs by the weak dynamics of regeneration. The formation of liver as a body has not been completed. The separate sinusoids are deprived of the endothelial lining. Bilious channels are at the stage of formation and consist of a single layer of epithelium. The primitive structure of parenchyma is explained by the presence of residuals of yolk-sac. With the active exogenous feeding in the cytoplasm of hepatocytes the glycogen is intensively stored and numerous lipid drops are presented. The histological picture shows the lack of zonality of organ and reflects the age-dependent features of the liver parenchyma of the Russian sturgeon. The quality of feed is determined by the type and balance of contents spare substances in the liver and are depending on the age of the fish. The period of passing to the external feed is considered as a critical period of development. Food activity justifies the increase of the organ synthetic activity. The liver parenchyma is in the process of formation, the zonality in its structure is traced distinctly, the number of sinusoids is increased. Strengthening of secretion of bile is marked. The bulk of hepatocytes is characterized by the contrasting polymorphic features. The intensity of formation of the liver parenchyma is caused by active resorption of yolk granules. The final phase of differentiation of the liver coincides with the end of larvae transition to the exogenous feed. The diminishing of sizes of hepatocytes and their nuclei is typical diagnostic sign and is accompanied by the considerable leveling of cellular polymorphism. The protracted flow of larval period and its difficult passing to the beginning of young period is the feature of early postnatal ontogenesis of the Russian sturgeon. We can say that at present time, not enough attention is paid to the study of critical periods of development of fish. The examined question has perspective in further researches of change of histological structure of organs. The results of histological researches of specific reaction of organism on the changing conditions of the environment and trophism can be used for the exposure of rejections in development, which cause mass death of posterity.


Russian sturgeon, larva, hepatocytes, liver, parenchyma, exogenous feeding


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Publication of the article:

«Bulletin of problems biology and medicine» Issue 3 part 3 (112), 2014 year, 27-30 pages, index UDK [597-14: 597. 563]: 639. 372. 33