In ISRI physiology department, various functions of Sturgeon, such as how to feed, breathe, move and what they are doing to survive are subjects of 25 years’ research experience. How to adapt the living organism to environmental events such as moving to find appropriate position in nature, food, etc., how to work senses, practice the biological functions and how to connect mentioned factors to healthy and good growth of fish are inquiring. The main objective of physiology and biochemistry department is to achieve optimal and suitable conditions for the proliferation, feeding, growth and survival of Sturgeon via carrying out related research projects with close collaboration with ISRI research departments.