Comparisons of oxygen consumption and ammonia-N excretion of five penaeids

Abstract

Five species of penaeids were individually subjected to 30 ppt sea water at 25oC. Ox consumption and ammonia-N excretion were monitored for 6-24 h. Mean oxygen consump was highest (0.91 02 mg/g/h) for Penaeus chinensis Osbeck, followed by 0.71, 0.71, 0.60, 0.49 02 mg/g/h for P. penicillatus Alcock, P. monodon Fabricius, P. japonicus Bate, and Me naeus ensis de Haan, respectively. Mean ammonia-N excretion was highest (0.027 mg/g/h P. japonicus, followed by 0.023, 0.021, 0.020, and 0.019 mg/g/h for P. monodon, P. pencill M. ensis, and P. chinensis, respectively. The O:N atom ratio indicated that metabolism of japonicus and M. ensis is protein-dominated, that of P. monodon and P. penicillatus is lip dominated, and that of P.chinensis is highly lip