Modern industrial technologies of fish farming make it possible to obtain products of high quality. However, there are stress conditions in an artificial ecosystem (high stocking density, disbalance of optimal hydrochemical conditions). They can adversely affect the eating activity, growth rate and lead to nutritional diseases and depletion of antioxidant capacity [3, 9, 11, 20, 22, 26].
Loss of appetite, decreased rate of growth, reduced activity, and increased death rate are the features of weakening the antioxidant organism defence. Besides, there are muscular atrophy, fatty liver degeneration, accumulation of fluid in the abdominal cavity, RBC hemolysis, decreasing hematocrit [24, 29].
Additional dietary fortification with biologically active substances such as feed additives, vitamins and vitamin-mineral complexes stimulates the fish organism increasing the producing capacity of farmed fish and the fish farming enterprise’s profitability.
The appearance of new specimens with antioxidant properties helps to improve feeding technology and increase prooxidant-antioxidant balance.
Since ecological safety is an important factor for choosing antioxidant feed additive, not without interest are the natural bio-antioxidants of flavonoid origin, particularly taxifolin. This natural flavonoid found out of Larch has a wide range of properties. It is involved in the synthesis of vitamin P, decreases capillary permeability and fragility, and others [8].
The purpose of the research is the impact of bioflavonoid taxifolin and immunostimulant arabinogalactan on farming efficiency and physiological state of hybrid Tilapia juveniles Oreochromis mossambicus × Oreochromis niloticus.
Experiments were performed at the Innovation Centre Bio-aquapark - Research and Development Centre of Aquaculture, Astrakhan State Technical University. The object of the research was a hybrid Tilapia Oreochromis mossambicus × Oreochromis niloticus, a well-known object of aquaculture.