Establishment of a dynamic energy budget (DEB) growth model for Sinonovacula constricta

The purpose of this study is to establish a numerical model of dynamic energy budget for Sinonovacula constricta. According to DEB theory, the basic parameters of the model were measured and calculated by corresponding methods: shape coefficient δ_m, energy per unit volume of Arrhenius temperature T_A, per unit time p_M, energy needed to form structural matter per unit volume E_G and maximum stored energy per unit volume E_M. Taking water temperature and chlorophyll concentration as forced functions, and based on the growth data of S. constricta from different seedling sources and water quality factors in ponds, STELLA 10.0 software was used to establish the DEB model of the system. The results show that the mean value is 0.3458, the average value of TA is (5 448±960) K, p_M=17.68 J/(cm³·d), E_G=4 050 J/cm³, E_M= 1 840 J/cm³; and the constructed DEB model can well simulate the growth of dry weight of the soft body part and reflect the energy distribution at different time. The water temperature of the seedling released in spring was the main growth restriction factor from August 10 to September 20, and the food was the factor from September 30 to November 10. The main limiting factor was that S.constricta released in autumn showed a strong temperature limit from July 1 to September 20, while the food limit ran through the whole simulation period, with the maximum limit from March 10 to May 20. It is inferred that S. constricta released in autumn could increase the supply of food algae in spring and reach the commercial specification before high temperature in summer.