Effect of Nitrite Toxicity in Carbohydrate Metabolism to Fresh Water Fish Cirrhinus Mrigala

Abstract

The aim of the present study was to evaluate about the glucose, glycogen content in liver and muscle in fresh water fish Cirrhinus mrigala exposed to nitrite toxicity. Plasma glucose level of Cirrhinus mrigala exposed to sublethal toxicity (28.31) of nitrite exhibited a significant increase throughout the study period (Table 20 and Fig. 19). The significant increase in plasma glucose level was directly proportional to the exposure period showing a minimum percent increase of 3.69, 5.55, 13.34, 20.53 at the end of 7 th, 14 th , 21 st , 28 th , day and a maximum percent increase of 23.86 at the end of 35 th day. The changes in the liver glycogen content of fish Cirrhinus mrigala exposed to sublethal concentration of nitrite were presented in Table 21 and Fig. 20. The liver glycogen content was gradually increased as the exposure extended showing a percent increase of 1.24, 1.34, 2.04, 3.64 and 3.95 at the end of 7 th , 14 th , 21 st , 28 th , and 35 th days respectively. Table 22 and Fig.21 present the data on changes in the muscle glycogen content of fish Cirrhinus mrigala exposed to sublethal concentration of nitrite for 35 days. During the above treatment period the muscle glycogen content was decreased throughout the study period showing a percent decrease of -7.44, -3.79, -10.37, -16.27, -31.03 at the end of 7 th , 14 th , 21 st , 28 th and 35 th days, respectively.