The experiment determined the metabolic rates of inorganic phosphorus

nitrite nitrogen

nitrate nitrogen and ammonia on

M.japonicus

under different conditions. Results show that : temperature

weight

salinity

pH and feeding status effect metabolism. The metabolic rates of Phosphorus

nitrate nitrogen and ammonia nitrogen were negatively correlated with weight

but the metabolic rates of nitrite nitrogen decreased when weight increased. In the range of 20~30 ℃

as the temperature rose

the metabolic rates of phosphorus

nitrite nitrogen

nitrate nitrogen and ammonia increased. In the range of 10‰~31‰

as the salinity increased

the metabolic rates of phosphorus and nitrite nitrogen by

M.japonicus

(6.739±0.023) g increased

when the salinity is 31

the metabolic rates of phosphorus and nitrite nitrogen is (0.736±0.002) μg·g

-1

·h

-1

(0.0778±0.011) μg·g

-1

·h

-1

the metabolic rates of nitrate nitrogen

ammonia nitrogen decreased

when the salinity is 31

the metabolic rates of nitrate nitrogen

ammonia nitrogen is (0.257±0.207) μg·g

-1

·h

-1

(4.445±0.259) μg·g

-1

·h

-1

.In the range of 7.5~9.0

as the pH increased

the metabolic rates of phosphorus by

Mjaponicus

(6.749±0.013) g decreased significantly. the metabolic rates of nitrate nitrogen and ammonia nitrogen increased. When pH was 8.5

the metabolic rates of nitrite nitrogen reached the maximum. Relative to the state of hunger

in the condition of feeding formula foodstuff

the metabolic rates of phosphate

nitrite nitrogen

nitrate nitrogen

ammonia nitrogen by

Mjaponicus

(6.729±0.028) g

increased 272.02%

91.67%

795.38%

98.54%.