Microarchitectonics of female sharptooth catfish gonads grown in an artificial environment
The article presents the research results obtained by use of probiotic «Sporothermin» for the cultivation of females of African sharptooth catfish in an artificial environment. Sporothermin is a probiotic that is a mixture of Bacillus subtilis and Bacillus licheniformis, which provides an increase in the adaptive abilities of fish to the long-term action of various adverse factors, which is relevant when growing in an artificial environment. The histological structure of the gonads of female sharptooth catfish was analyzed using a research motorized universal microscope Axio Imager. M2 (Carl Zeiss, Germany). The results of our research have shown that in sharptooth catfish grown using the probiotic «Sporothermin», germ cells are observed, represented by oogonia and young oocytes of the protoplasmic growth period. Oocytes appear, that finished protoplasmic growth as well as oocytes that have completed trophoplasmic growth. At this stage, oocytes in the cytoplasm contain fat droplets that are part of the yolk grains, coloring from light yellow to orange with various shades. Female sharptooth catfish (Clarias gariepinus) of the control group, grown without the use of the probiotic «Sporothermin», have a violation of the synthesis of yolk granules, as well as edema of the follicular layer of the gonads, resorption of yolk grains and edema of the connective tissue egg-bearing plate, there is no striation of the radial layer, and deformation of the trophoplasmic oocyte is noted. In histological studies of the gonads of female sharptooth catfish, it was found that the use of the probiotic «Sporothermin» leads to a decrease in disorders in their microstructure, due to the strengthening of the membranes of the gonad cells.