Effects of seawater acidification on growth,and respiratory metabolism of mantis shrimp(Oratosquilla oratoria)
To probe effects of seawater acidification on growth,feeding,and respiratory metabolism of mantis shrimp Oratosquilla oratoria,the mantis shrimp weighing(10.90±0.33)g was reared in 3 PVC cylindrical tanks of each 1.0 m height,and diameter 1.0 m,and exposed to pH 8.10(control group)pH 7.90,pH 7.70,and pH 7.50 prepared by pure CO2 aeration for 49 days.During the experiment,the weight gain rate,specific growth rate,dressing rate,daily food intake,survival rate,as well as oxygen consumption rate and ammonia excretion rate of the mantis shrimp were determined.The results showed that there was significant impact of pH value of seawater on the weight gain rate,specific growth rate,dressing rate,daily food intake,survival rate,oxygen consumption rate,and ammonia excretion rate of the mantis shrimp(P<0.05),with decrease in weight gain rate,specific growth rate,and dressing rate of the mantis shrimp and increase in the daily food intake with the decrease in pH value.The oxygen consumption rate and ammonia excretion rate of the mantis shrimp were shown to be increased with the decrease in pH value,with a trend of first decreasing and then increasing in O∶N value.At the end of the experi-ment,there was survival rate of 98.41±0.72%,98.10±0.68%,97.74±0.80%and 95.31±1.25%of the mantis shrimp in each group,respectively.The significantly lower survival rate was found in pH 7.50 group than that in the control group(P<0.05).The findings indicated that acidification led to adverse effects on the feeding,growth and the respiratory metabolism of the mantis shrimp,with increase in the oxygen consumption rate and ammonia excre-tion rate of the mantis shrimp with the decrease in pH value.
NETL
NSTL
万方数据
