Impact of Ecological Factors on Fishery-Biological Parameters of Acipenserids under Arid Conditions of a Closed Water Supply Cycle

摘要

Abstract The impact of ecological factors (abiotic and biotic) on some fishery-biological parameters is studied with the raising of acipenserids under arid conditions with a closed cycle of water supply (CCWS). The elements of a CCWS include the temperature, pH, oxygen concentration, and an artificial environment with varying oxygen supply. It was found that a significant increase in the content of a marker of oxidative stress is established in the blood of fish raised under a CCWS with an increased oxygen content by the end of experiment (four weeks). An oxygen content below 70% retards growth in the starlet, as food consumption is noticeably decreased. To obtain a high biomass in CCWS complexes, it is necessary to set the water temperature to 21–22°C in the basins of semidesert climate conditions and to have a stocking density of 60 kg/m_(3)for the commercial growth of sterlet.