Effects of dissolved oxygen on oxygen consumption and ammonia type fixed nitrogen excretion of Penaeus chinensis juveniles

Abstract

When Penaeus chinensis juveniles (0.346 ± 0.065 g) were subjected to decreased dissolved oxygen (DO) levels in the range of 6.60-3.84 mg/l at 25°C and 30 ppt after 6, 12 and 18 h, the oxygen consumption rate was highest (0.671 mg/g/h) and ammonia-N excretion rate lowest (35 ug/g/h) at 3.84 mg/l DO. The decrease of the DO levels to both 4.68 and 5.55 mg/l significantly decreased the oxygen consumption rate of P. chinensis in 12 h (p ＜ 0.05).