Abstract
1. 1. Eyestalk unablated and unilaterally ablated Penaeus monodon juveniles had survival rates after 5 months of 75–72.5 and 67.5–60%, respectively. 2. 2. Unilaterally ablated shrimps had significantly higher ( P < 0.05) growth rate than unablated shrimps. 3. 3. Eyestalk-ablatement resulted in a decrease in the haemolymph sodium concentration and an increase in the potassium and calcium concentration of shrimps. 4. 4. The osmolarity of haemolymph and total protein concentration of unablated shrimps were demonstrated to be higher than those of unilaterally ablated shrimps. 5. 5. The eyestalk-ablated shrimps possess higher total ATPase and Na +,K +-ATPase activities in the gill than those of unablated shrimps.
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