Carbohydrate reserve and its mobilization in Channa punctatus (Bloch.) with special reference to sex, seasons and agrochemicals

Kumar Saurabh^a, Mrigendra Narayan Singh^a, Ramanand Prasad^a & Mohita Sardana^b
aFish Research Laboratory, P.G. Department of Zoology, A. N. College, Patna – 800023 (Bihar), India
^bDept. of Zoology, Magadh Mahila College, Patna University, Patna (Bihar), India
Received 5th April, 2010; Revised 4th August, 2010

Abstract : The present investigation was conducted to assess the effects of sub lethal (LC0) and semi lethal (LC50) concentrations of the various agrochemicals (Ekalux EC25, Cypermethrin 10%, Fenvalerate 20% EC, Omite and Lambda Cyhalothrin 2.7% EC) on carbohydrate metabolism in Channa punctatus (Bloch.) in different sexes during different breeding periods. The level of serum glucose in both the sexes of the test fishes were observed as highly significant (P<0.001) in mixture of agrochemicals during all the three periods. The liver glycogen level in both sexes with the mixtures of agrochemicals during breeding period is comparatively low but at few occasions no consistent results were observed. Highly significant (P<0.001) values for Normal, LC0 and LC50 concentrations for the mixture of agrochemicals during all the reproductive periods were obtained. The muscle glycogen level was obtained comparatively low in breeding period than pre breeding and post breeding periods. The efficacy of the mixture of agrochemicals in normal, LC0 and LC50 concentrations for all the reproductive periods were highly significant (P<0.001). The brain glycogen level showed decreasing tendencies in breeding period in comparison to pre breeding and post breeding periods. However, the value of ‘t’ test showed highly significant (P<0.001) in all the cases. The result indicated the extent of damage caused to the test fish dependent on concentrations of the mixture of agrochemicals.

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