Ribogospod. nauka Ukr., 2016; 3(37): 123-144
DOI: https://doi.org/10.15407/fsu2016.03.123
УДК 597-113.2:597.442

pdf35FEATURES DIGESTION OF STURGEON SPECIES (ACIPENSERIDAE) (REVIEW)

M. Simon, This email address is being protected from spambots. You need JavaScript enabled to view it. , Institute of Fisheries NAAS, Kyiv

Purpose. To review scientific sources are about the anatomical, physiological and biochemical characteristics of the digestive system and proper digestion process in the sturgeon species (Acipenseridae). Outline the common anatomical and morphological characteristics of the gastrointestinal tract. Consider the activity of digestive enzymes and the influence of various factors.

Findings. Review of scientific papers reveals that although the digestion of sturgeon are broadly similar to those of the cartilaginous and bony fish, there are a number of species specificity. In particular, sturgeon enzymes have a wider temperature and hydrogen ranges. It is confirmed that temperature adaptations of digestive system poikilothermic organ-isms are realised mainly thanks to reorganisations of fermental systems. It is shown that enzymes in sturgeons are adjustable, as their activity level significantly changes under the influence of divalent metal ions (Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+). The assumption that evolutionary adaptation of hydrolytic function of intestines of fishes to temperature conditions of an inhabitancy takes place, apparently, is made. The paper describes the effect of sex and age factors on the level of activity of enzymes of sturgeons. Set out the regularities of circadian rhythms of the fish of this family. Showed specific features of the liver and its involvement in lipid metabolism and antioxidant defense system.

Practical value. The knowledge of hydrolysis characteristics of a diet of sturgeon species is important for the efficiency estimation of feeding and understanding of evolutionary and ecological aspects of digestion physiology. Systematized data on the digestive system of fish sturgeon species are of interest a wide range of research in two main areas. Firstly, although the sturgeon are relict species, but the adaptation of their digestive system is still going on, allowing you to analyze the evolutionary development of the species. Secondly, the digestive system of sturgeon species in their structure is close to a tailless amphibians, differing cartilaginous and bony fishes. Generalized mass of information will be important for scientists studying the features of feeding of sturgeon species, their adaptation devices and biochemical features.

Keywords: sturgeon (Acipenseridae), digestive system, cavitary digestion, membrane digestion, circadian rhythms, digestive enzymes, liver of sturgeons, intestinal microflora, metal ions, temperature, pH.

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