The effects of eyestalk ablation on oxygen consumption and ammonia-N excretion of Penaeus monodon were investigated for 24-hr period. The oxygen consumption and ammonia-N excretion were high in shrimp treated bilaterally, intermediate in shrimp treated unilaterally and low in intact shrimp. Eyestalk ablation resulted in an increase of oxygen consumption and ammonia-N excretion, but a decrease in the O:N ratio (by atoms), indicating a shift from lipid-dominated to protein-dominated metabolism. Lethal dissolved oxygen was low in shrimp treated unilaterally, intermediate in intact shrimp and high in shrimp treated bilaterally. Lethal time was longest in intact shrimp, intermediate in shrimp treated unilaterally and shortest in shrimp treated bilaterally.
Penaeids, Respiration, Nitrogen excretion, Metabolism
