Abstract
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 μmol Pi mg/protein/hr) than in intermoult prawns (0.58 μmol Pi mg/protein/hr) while at high alkalinity enzyme activity was equally high in both postmoult and intermoult prawns (1.29 and 1.30 μmol Pi mg/protein/hr respectively). The activity in postmoult prawns did not differ significantly at the low and high alkalinities.
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