Study on Respiration and Oxygen Consumption Rate of Summer Flounder(Paralichthys dentatus) Juvenile

The observations and studies on the respiration frequency, oxygen consumption rate and asphyxia of summer flounder juvenile were made, and it is shown from the study results that the respiration frequency of juvenile increased with increasing water temperature and was 60 to 100 times/min in the range of suitable water temperature; the oxygen consumption was in positive correlation with the fish weight, and their correlation was M=1.8469 W~(0.8317)(r=0.9116). The oxygen consumption rate increased with increasing water temperature and salinity, and the mean oxygen consumption rate of 108 g fish at about 20 ℃ within 24 hours was 1.6676 μg/(min·g), which is lower than those of Japanese flounder(2.68 μg/(min·g)) and turbot (3.4667 μg/(min·g)). The daytime oxygen consumption rate was 1.824 μg/(min·g), and the night one was 1.511 μg/(min·g), so the daytime one is 1.21 times the night one. The half lethal suffocation point of summer flounder at 20 ℃ was 0.747 mg/L, and the full one was 0.569 mg/L.