Effect of dietary protein contents and water salinities on ammonia and urea excretion of different sizes giant tiger prawn (Penaeus monodon Fabricius)
1998
Pornsri Prarakkamo
Three different sizes of Giant Tiger Prawns (Penaeus monodon Fabricius), feeding on different dietary protein contents and water salinity levels, were analyzed for ammonia and urea excretion. Unfed control groups were also included in the analyzed. Ammonia and urea concentration in the water were determined hourly for six hours after feed. The proportion of ammonia on the total nitrogenous excretion were between 56.45-87.40 percent in 1.17 gm live weight, 62.53-88.35 percent in 5.25 gm live weight and 59.61-90.11 percent in 14.68 gm live weight. Ammonia excretion of the prawn were significant among differents dietary protein contents, water salinities and also significantly their interaction effects (P0.05). The result showed that the prawn mainly excreted in the form of ammonia. The ammonia excretion increased with dietary protein content and was not consequently with water salinities and the prawn sizes. Urea excretion of the small size prawn were significant among different dietary protein and salinity level. For the large size, there was significant effect of salinity on urea excretion.
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