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Mass-specific activity of arginase and nitrogenous excretion of Penaeus japonicus Bate (10.3 * 3.7 g) were measured for shrimps exposed to 0.029 (control), 1.007 and 10.054 mg 1-' ammoniaN at 32%, S for 24 h. Arginase specific activity of gill, hepatopancreas and midgut increased directly with ambient ammonia-N, whereas arginase specific activity of muscle was inversely related to ambient ammonia-N. Excretion of total-N (total nitrogen), organic-N and urea-N increased, whereas excretion of ammonia-N, nitrate-N and nitrite-N decreased significantly with an increase of ambient ammoniaN. In the control solution, japonlcus excreted 68.94% ammonia-N, 25.39% organic-N and 2.87% urea-N. For the shrimps exposed to 10 mg 1" ammonia-N, ammonia-N uptake occurred, and t.he contribution of organic-N and urea-N excretion increased to 90.57 and 8.78%, respectively, of total-N. High levels of arginase specific activity in the gill, midgut and hepatopancreas suggest that there is an alternative route of nitrogenous waste for P. japonicus under ammonia exposure.

Arginase specific activity and nitrogenous excretion of Penaeus japonicus exposed to elevated ambient ammonia