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image of Journal of Crustacean Biology

ABSTRACT Five species of penaeids were individually subjected to 30 ppt sea water at 25°C. Oxygen consumption and ammonia-N excretion were monitored for 6-24 h. Mean oxygen consumption was highest (0.91 O2 mg/g/h) for Penaeus chinensis Osbeck, followed by 0.71, 0.71, 0.60, and 0.49 O2 mg/g/h for P. penicillatus Alcock, P. monodon Fabricius, P. japonicus Bate, and Metapenaeus ensis de Haan, respectively. Mean ammonia-N excretion was highest (0.027 mg/g/h) for P. japonicus, followed by 0.023, 0.021, 0.020, and 0.019 mg/g/h for P. monodon, P. pencillatus, M. ensis, and P. chinensis, respectively. The O:N atom ratio indicated that metabolism of P. japonicus and M. ensis is protein-dominated, that of P. monodon and P. penicillatus is lipid-dominated, and that of P. chinensis is highly lipid-dominated.


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