Alterations in concentrations of protein, carbohydrate, glycogen, free sugar, and lipid in the prawn Macrobrachium malcolmsonii on exposure to sublethal concentrations of endosulfan
1997
Bhavan, P.S. | Geraldine, P.
Juveniles of Macrobrachium malcolmsonii (4.5-5.0 cm in size and 1.0-1.25 g in weight) were exposed to three sublethal concentrations of endosulfan (10.6, 16.0, and 32.0 ng/L) for 21 days. Samples were taken from the hemolymph, hepatopancreas, gills, and muscle of representative prawns from each test and control group on the 1st, 8th, 15th, and 21st day after the start of the experiment. The total protein concentration was found to be higher in the hemolymph (on all sampling days) and hepatopancreas (only on days 1 and 8) of test prawns, particularly those exposed to 10.6 ng/L of endosulfan, than in the same tissues of controls. However, the total protein concentration in the gills and muscle of test prawns was found to be lower, on all sampling days, than that in the same tissues of controls; the total protein content of gills and muscle was lowest in prawns that had been exposed to 32.0 ng/L of endosulfan. The total carbohydrate and glycogen content was found to he lower, in comparison to controls, in the hepatopancreas, gills, and muscle of test prawns, especially those exposed to 32.0 ng/L of endosulfan; this was seen on all sampling days. The total free sugar was found to be higher in the hemolymph of test prawns, particularly in those exposed to 32.0 ng/L of endosulfan, than in that of controls. The content of total lipid was found to be higher in the hepatopancreas of the test prawns, especially those exposed to 32.0 ng/L of endosulfan, than in the hepatopancreas of controls. These data strongly suggest that endosulfan is toxic to M. malcolmsonii since it seriously impairs the metabolic functions, resulting in alterations in major biochemical constituents, particularly in the muscle. Since the nutritive value of this prawn is greatly affected by exposure to endosulfan, suitable remedial measures are necessary.
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