Abstract: Design of an oxygen consumption test device for fish is described,and the oxygen consumption and asphyxia point were practically determined in juvenile paddlefish with body weight of(156±3.36)g.In the design of the device,the structural variables were found to ensure the even water flowing in a respiratory chamber,and sampling accuracy without air bubble interference,and to observe the fish behavior conveniently with accuracy data during determination of the fish oxygen consumption,and suffocation point.By the oxygen consumption test device,the paddlefish juveniles were showed to have the maximum oxygen consumption of(0.528 + 0.035) mg·g-1·h-1,the minimum oxygen consumption of(0.197 + 0.028) mg·g-1·h-1,and asphyxia point of 3.468mg·L-1 dissolved oxygen.

Key words: oxyen consumption in fish, test equipment, paddlefish