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鲻鱼肠道内的鲻长尾吸虫（Ｅｌｏｎｇｉｎｕｅｕｓ ｍｕｆｉｌｕｓ Ｌｕ，１９９５）随着宿主体长的生长，其感染率的变动范围在２８．８９％～３１ ９３％之间，而感染强度和种群平均密度呈现不规则的变动；体长在４０～１０６ｍｍ 范围内，种群平均拥挤度，扩散性指标则随着体长的生长有逐渐增加的趋势，而负二项参数则逐渐降低；在不同的月份中，吸虫在宿主体内的感染率，感染强度和种群平均密度均呈不稳定的地动．吸虫种群在不同体长组和不同月份的宿主体内的时空分布类型均为聚集分布，而且聚集强度随着种群密度增加而增强，从吸虫种群在宿主体内的频率分布中，表明多数宿主不感染或只感染少量的吸虫，而较大数量的吸虫只寄生于少数的宿主。
Elonginueus mufilus Lu (1995) showed that the infection rate varied from 28.89% to 31.93% with the growth of the host body length, whereas the infection intensity and the average density of the population appeared Irregular change; body length in the range of 40 ~ 106mm, population average crowding degree, diffusivity index with the growth of body length has a tendency to gradually increase, while the negative two parameters gradually decreased; in different months, Trematodes in the host infection rate, the intensity of infection and average population density showed instability. The spatial and temporal distribution of fluke population in different body length groups and different months of the host body are aggregated distribution, and the aggregation intensity increases with population density. From the frequency distribution of the fluke population in the host body, it indicates that most hosts are not infected or Only a small number of flukes are infected, while larger numbers of flukes parasitize only a few hosts.