The study of relationships between growth, molt and accumulated temperature of the Chinese mitten crab (Eriocheir sinensis)

Abstract:

To study the relationship between growth,molt and effective accumulated temperature of the Eriocheir sinensis, the cages were placed in the middle of the ecology pond to culture E. sinensis. The temperature logger underwater penetration of the probe is 20 cm, and cleaned once a week, with record time interval for 20 minutes at a time. Check at least every morning and evening once a day. Each cage stocked 500 Megalopa, Altemanthena philoxeroides were hidden objects, breeding with same and suitable growth environment. Excel and SPSS 22.0 software are applied for statistics analyses of data. After 158 days of cultivation, juvenile crab molted 11 times and developed into the crab. The average survival rate was 28.43%±4.61%, the average temperature was (24.4±0.05)℃, the total effective accumulated temperature was (3040.4±244.16)℃·d, and with the E. sinensis molt, the growth trend of effective accumulated temperature is mostly close to exponential function(y=40.942e^0.2655x, R²=0.9904). The growth trend of cumulative effective accumulated temperature was mostly close to the polynomial(y=33.336x²-115.05x+196.14, R²=0.997 8). With the growth of the effective accumulated temperature, the specific growth rate showed exponential growth of relations(y=20.926e^-0.005x, R²=0.933 3). The correlation between cumulative effective accumulated temperature and shell length, shell width, body height is very significant. With the growth of the cumulative effective accumulated temperature, shell length, shell width, and body height showed exponential growth of relations.