Publication Abstract

Effects of Environmental Alkalinity on Calcium-Stimulated Dephosphorylating Enzyme Activity in the Gills of Postmoult and intermoult Giant Freshwater Prawns Macrobrachium Rosenbergii (De Man)

Effects of Environmental Alkalinity on Calcium-Stimulated Dephosphorylating Enzyme Activity in the Gills of Postmoult and intermoult Giant Freshwater Prawns Macrobrachium Rosenbergii (De Man)

M.A. Latif, J.H. Brown, J.H. and J.F. Wickins

Evidence of calcium-stimulated dephosphorylating enzyme activity was found in the gills of the giant freshwater prawn Macrobrachium rosenbergii. The activity of the enzyme was influenced by environmental alkalinity. Branchial enzyme activity was measured in postmoult and intermoult prawns exposed to low (25 mg/l) and high (250 mg/l) alkalinity waters maintained at 20 mg/l total hardness. At low environmental alkalinity, the enzyme activity was higher in postmoult (2.11 mu mol Pi mg/protein/hr) than in intermoult prawns (0.58 mu mol Pi mg/protein/hr) while at high alkalinity enzyme activity was equally high in both postmoult and intermoult prawns (1.29 and 1.30 mu mol Pi mg/protein/hr respectively). The activity in postmoult prawns did not differ significantly at the low and high alkalinities.

Reference:

M.A. Latif, J.H. Brown, J.H. and J.F. Wickins, 1994. Effects of Environmental Alkalinity on Calcium-Stimulated Dephosphorylating Enzyme Activity in the Gills of Postmoult and intermoult Giant Freshwater Prawns Macrobrachium Rosenbergii (De Man). Comparative Biochemistry and Physiology, 107(a4): 597-601

M.A. Latif, J.H. Brown and J.F. Wickins*

Comparative Biochemistry and Physiology, 107(a4): 597-601