FORMING OF SOME ORGANS OF HEMATOPOIESIS IN PRE-LARVAE, LARVAE AND FRY OF COMMON BREAM (ABRAMIS BRAMA L.)

Abstract

Ability for hematopoiesis of spleen, intestinal mucosa, and liver is investigated for early ontogenesis of common bream Abramis brama L., a species of bony fish widespread in the Russian waters, including Astrakhan region. The samples (24 ind.) were collected in the fish farm in Kamyzyaksky district of the region in middle May 2018, after hatching. Histological analysis was made by conventional methods. Both spleen, liver, and intestinal mucosa were formed in the first days after hatching. In the spleen, such signs of hematopoiesis as dispersed new developing blood particles were found just in the first day. In the intestinal mucosa, the first foci of hematopoiesis appeared in the nineteenth day. These organs were formed completely by the end of larval development, and the most intense level of hematopoiesis was observed in that time, with forming of blood cells of all rows of hematopoiesis. On the contrary, no signs of hematopoiesis were found in the liver throughout the larval and juvenile periods.