COMPARATIVE STUDY ON GROWTH MODELING AND FATTENING OF SINONOVACULA CONSTRICTA SOWN IN SPRING AND FALL
Spring and fall are the two seasons for Sinonovacula constricta culture seeding,and the growth of S.constricta seeded in spring and fall differs due to variances in water temperature and baits used in the culture practice.To more intuitively describe the growth process of the razor clams sown in spring and fall,four growth models,namely,von Bertalanffy,Gompertz,Logistic,and Brody,were chosen to fit the shell length and wet weight growth,and to determine the optimal growth model of them.Meanwhile,annual fluctuations in fullness were detected.The Logistic model was shown the best fitting model for shell length and wet weight growth of S.constricta sown in spring,while the Logistic model and von Bertalanffy model were found the best fitting models for those in fall.The inflection point of shell length was earlier than that of wet weight development in both seasons.For S.constricta sown in spring and fall,the inflection points of shell length were 51.95 days(shell length 24.32 mm)and 76.25 days(shell length 29.30 mm),respectively,and the inflection points of wet weight development were 108.09 days(wet weight 2.75 g)and 147.98 days(wet weight 5.64 g).There were two peaks in the annual fullness changes of S.constricta sown in spring and fall.In May of the following year(247 d),the individual size of S.constricta sown in the fall might drop below 100 ind./kg when combined with the recorded growth data,whereas S.constricta sown in the spring required 327 days of culture to achieve 100 ind./kg.Therefore,the seeding culture in fall can save time by three months as compared to the spring case,which can lessen the risk of culturing as well as the cost.This study provided a scientific theoretical basis for the fall seeding of S.constricta,which can be used as a technical reference to shorten the culture cycle for early harvesting and marketing.
万方数据
维普
