摘要
日本刺沙蚕Ｎｅａｎｔｈｅｓｊａｐｏｎｉｃａ在庄河市青堆子湾的繁殖时间始于３月下旬，终于５月底；４月下旬是其幼虫发生的高峰。从１９９１年５～８月调查了虾池中沙蚕种群数量变化规律和生物量消长动态。结果表明，沙蚕附着密度是３９８３～２２０５５尾ｍ￣（－２）；附着期间幼体死亡率是８４％～９２％。在对虾养殖期间，沙蚕平均密度（尾ｍ￣（－２））是２４８９（１１３０～３８４８）；平均生物量是１０１．３１（５７．４３～１４５．１８）ｇ·ｍ￣（－２）；对虾摄取沙蚕的捕食率是７９．４３（７５．３４～８９．５２）％。回归分析法的评价结果表明影响沙蚕附着期死亡率的主要因素是其本身密度；以及密度与面积，盐度与温度的交互作用。
Biomass and population dynamics of Neanthes japonica(Polycheta:Nereicse)in shrimp ponds have been studied from March to August,1991.This population repreduces from march to June with a peak in April,and the initial number varies from 3 983 individuals m￣(-2) to 22 055 individuals m￣(-2).The mean standing stock lies from 57.43 g m￣(-2)to 145.18 g m￣(-2) over the life time. Total numbers vary between 1130 ind.m￣(-2)and 3 848 ind.m￣(-2) ,with a mean of 2 489 ind.m￣(-2).From the iegression analysis it is shown that the important factors af fecting the mortality of sand worm larva are:population density,salinity, the in-teractions between population density and the area of shrimp ponds and the inter-action between salinity and temperature.It is found that the presence of shrimp predators is the main reason for decrease in sand worm number from May to Au-gust,1991.Predatory rates of shrimp to sand worm are 75.34～89.52 percent,with a mean of 79.43%.
出处
《大连水产学院学报》
CSCD
1994年第1期12-20,共9页
Journal of Dalian Fisheries University
关键词
生物量
多毛纲
日本刺沙蚕
Riomass
Dynamics
Polychaeta
Neanthes japonica
