摘要
黄墩支港的蛤仔群体组成以2龄贝为主,占87.5％。体重与壳长之间关系为:W=0.1491L^(3.2590)。其生长适合于Logistic自然生长方程(tm为月龄)。壳生长曲线的拐点为25.31月龄,其生长速度能反映生长过程的变化特征,合理捕捞的生物学指标应以生长转折点以后较为适当。主要采2.76厘米左右大规格的2龄贝和3龄贝。 黄墩支港蛤仔资源实际结算量为9243吨,理论估算量为9640吨,合理捕捞量估算为3500—4000吨。采捕季节规定4—8月为宜。
For the purpose of the rational management and stock propagation, this paper deals with a detailed investigation on the population dynamics of clam (Ruditapes philippinarum) at Huangden area in Xiangshan harbour during the period of July 1984 to October' 1985. The stock composition is mainly made up of two years old clams, being up to 87.5% of the total. According to the variation in the increment rate of shell fringe new rings largely appear in December. The shell length and shell height as function of the length of shell's fringe (R) can be expressed as:L, = 1.2020R + 0.0410; H = 0.7827R + 0.1719. The relationship between body weight and body length is W = 0.1491L3.2590. Its growth rate fits in with Logistis natural equationThe inflexion point of the shell length increment curve is at 25.31 month age. The curves of growth and acceleration can reflect the nature of changes in the growing process. The practical estimation of the resources amount at Huangden area agrees basically with the theoretical estimation (about 9.0 thousand ton). The rational catching amount should be 3.5 - 4.0 thousand ton). It is necessary to suggest that minimun legal harvestable age, size and catching season should be 2 years old, 2.76cm in length and from April to August.
出处
《生态学报》
CAS
CSCD
北大核心
1989年第4期297-303,共7页
Acta Ecologica Sinica
关键词
贝类
蛤仔
种群动态
繁殖保护
shellfish
clam
population dynamics
propagation protection.
