THE EFFECTS OF EYESTALK ABLATION ON OXYGEN-CONSUMPTION AND AMMONIA-N EXCRETION OF JUVENILE SHRIMP PENAEUS-MONODON

The effects of eyestalk ablation on oxygen consumption and ammonia-N e xcretion of Penaeus monodon were investigated for 24-hr period. The ox ygen consumption and ammonia-N excretion were high in shrimp treated b ilaterally, intermediate in shrimp treated unilaterally and low in int act shrimp. Eyestalk ablation resulted in an increase of oxygen consum ption and ammonia-N excretion, but a decrease in the O:N ratio (by ato ms), indicating a shift from lipid-dominated to protein-dominated meta bolism. 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 tre ated unilaterally and shortest in shrimp treated bilaterally.