301CHROMIUM INDUCED PHOSPHATASES ALTERATIONS IN SELECTED TISSUES OF FRESH WATER FISH CATLA CATLA (HAMILTON)In the Present study tissue homogenates of the freshwater fish Catla catla revealed the extent of alkaline phosphates activity to be higher than that of acid phosphates activity. The decline in phosphates activity as a function of sub lethal concentrations of heavy metal chromium was evident which reflects the damage and degradation of Lysosome during stress in the biological system. Concentration as well as exposure period dependent statistically significant (P<0.05) inhibition in acid phosphates activity in liver and intestine and alkaline phosphates activity in liver and intestine of Catla catla are advocated as bioindicators of water borne heavy metal chromium stress.smile.suresh3@gmail.comResearch4102013Chromium,Phosphatases, Catla catla,Lysosome,BioindicatorsSuresh B,Samba Naik A,Ravi Babu B,Lakshmana Swamy P,Cyril Arun Kumar L,Jagadish Naik MDepartment of Zoology, Acharya Nagarjuna University, Guntur, Andhra Pradesh, India.,Department of Zoology, Acharya Nagarjuna University, Guntur, Andhra Pradesh, India.,Department of Biotechnology, Acharya Nagarjuna University, Guntur, Andhra Pradesh, India.,Department of Biotechnology, Acharya Nagarjuna University, Guntur, Andhra Pradesh, India.,VSR&NVR College (Autonomous), Tenali, Guntur, Andhra Pradesh, India.,Department of Zoology, Acharya Nagarjuna University, Guntur, Andhra Pradesh, India.