期刊
FISHERIES SCIENCE
卷 74, 期 3, 页码 488-493出版社
SPRINGER JAPAN KK
DOI: 10.1111/j.1444-2906.2008.01550.x
关键词
calcification; carbonic anhydrase; Macrobrachium rosenbergii; molting; Na/K-ATPase
类别
In the present study, the role of carbonic anhydrase (CA) and Na/K-ATPase in the gill and epidermal tissues in the giant freshwater prawn Macrobrachium rosenbergii was examined as a function of molting stage. CA activity levels in the front and back gills were low at the intermolt stage C-0, but increased significantly at premolt stage D-3, and then decreased after molting. In the epidermal tissue, activity levels decreased gradually towards premolt to a minimum level at stage D-3, but became elevated at postmolt stages A and B. Na/K-ATPase levels in the front and back gills did not change significantly during the molt cycle. CA in the gill is possibly involved in supplying counter-ions for ion uptake, while CA in the epidermal tissue may play a role in mineralizing the exoskeleton after ecdysis. Na/K-ATPase in the gills may function in ion uptake from the ambient medium; however, since its activity was not influenced by the molt cycle, it probably does not have a major role in osmoregulation in the freshwater environment.
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