摘要
象山港毛蚶年轮的形成周期为一年、形成时间主要在1月份。贝壳边缘增长率α=R-Rn/R计算式可作为确定贝壳年轮形成时期的理论指标。体重与贝体各维数之间相关式的最优方程为W=10^(-4)×7.782L^(0.1947)H^(0.3387)B^(2.4465),实际应用时可采用W=10^(-4)×9.258B^(2.97875)。毛蚶壳长生长方程为L=39.2739/1+e^(2.1394)-0.713889t。根据毛蚶壳长以及体重在生长过程中的变化特征等生物学指标为依据,确定最佳起捕年龄为40至43月龄,规格大小28mm至34mm。采捕季节规定为12月—3月为好。
The present paper deals with the observation on the age and growth of Arca subcrenata made during the period from July 1985 to June 1986 in Xiangshan harbour. According to the growth rate of the shell edge (a), it is considered that most of the new annual rings begim to appear in January in 1^+Year-old mussels. The optimum multi-Variable equation relating to the growth of the Arca subcrenata,can be established as: W=10^(-4)×7.782L^(0.1947)H^(0.3387)B^(2.4465). Since the growth of the shell's length corresponds with type 'S', an adapted logarithmcurve equation is obtained: Lt = 39.2739/1+e^(2.1394-0.07139t). The inflection point of the shell length increment curve is at 30 month age. The curves of growth and acceleration can reflect the nature of changes in the growing process. The paper suggests that the minimum legal havestable age, size and catching season should be 3^+ years old, 28-34 mm in length and from December to March.
