鲻体内的惠东拟囊腔吸虫 (SaccocoedioideshuidongensisL櫣 ,1993)随着宿主体长的生长 ,其感染强度、平均密度有逐渐增加的趋势 ,而感染率则呈不规则的波动 ;其感染率、感染强度和平均密度在不同月份亦呈不稳定变化 ;吸虫在宿主体内的频率分布表明 ,大量的吸虫寄生于少数宿主中 ,而多数宿主感染少量的吸虫 ;吸虫在不同体长组的分布类型为聚集分布 ,且聚集强度随种群密度的增加而增大 (1) Saccocoedioideshuidongensis L., 1993) showed an increasing tendency of infection intensity and average density with the growth of host body length, while the infection rate showed an irregular fluctuation; the infection rate, infection rate The intensity and average density also showed unstable changes in different months. The frequency distribution of Trichinella in the host showed that a large number of Trichinella were parasitized in a few hosts, while most hosts were infected with a small amount of Trichinella. The distribution types of Trichodina in different length groups were aggregated Distribution, and aggregation intensity increases with population density