Adverse Affect of Nitrite in Hemoglobin Content to Freshwater Fish ?Cirrhinus mrigala?

Pollution from toxic chemicals affects human health, environment, and ecology. Contamination of natural waters form anthropogenic sources of nitrogen is a widespread problem. In the aquatic environment, the most common ionic forms of inorganic nitrogen are nitrite (NO2-). These ions present naturally in aquatic ecosystems as a result of atmospheric deposition, surface and groundwater runoff, dissolution of nitrogen-rich geological deposits. This study represents the changes of nitrite ions in hemoglobin level to fresh water fish Cirrhinus mrigala. Table1. Represent the data on changes in the hemoglobin content of fish Cirrhinus mrigala exposed to sublethal concentration of nitrite for 35 days. On 7th day, the hemoglobin content in the nitrite exposed fish was found to be slightly increased showing a minimum percent of 2.26. However, after 7th day, a decrease in hemoglobin level was observed in the rest of the study period showing a minimum percent decrease of 5.44 at the end of 14th day and a maximum percent decrease of 9.86 at the end of 35th day. There were significant (P less than 0.05) variation among the treatments (F1, 40 = 232.02, P less than 0.05), periods (F4, 40 = 14.54 P less than 0.05) and their interactions (F4, 40 = 35.08, P less than 0.05).