Water quality is the most important factor for aquaculture. Aquatic animals and fish need to live and breathe in the water. The optimal water quality depends on the species and must be monitored to ensure growth and survival. Water quality can significantly affect the health of fish and improve the quality of caviar and fish meat, as a result it attracts customer satisfaction. Water quality parameters that commonly need to be monitored in aquaculture include temperature, dissolved oxygen, pH, ammonia, nitrite, alkalinity, and hardness. Water must also be free of biological, chemical and physical pollution. So we try to find regions that have high quality water and optimal factor for sturgeon to present the healthy and high quality product. Finally, the farms are located near the Caspian Sea in the province of Mazandaran-Sari. Using high quality groundwater, located in the Tajan River basin with a large source of fresh and good spring water. Our sturgeons like to live this clean place. To facilitate water supply and reuse, the solid particle of the water was removed with a drum filter, then treated with ozone and after intensive aeration recycled again. We have several ponds and salt for different stages of sturgeon growth and long-term sturgeon protection.

Models of culture
We grow sturgeon in a semi-closed ground-based aquaculture system with fresh water (15-21 c). Degassing Freshwater and return water filtered from the pond are mixed and pumped into a concrete pond. The chemical and physical parameters that frequently control water quality include temperature, pH, dissolved oxygen, ammonia, nitrates, etc. Finally, wastewater is released from the farm into the watercourse after the water refinery.