Abstract: [Objective] The aims to reveal population dynamics of Lota lota's intraocular parasitic Diplostomum.Mergi in Irtysh River (China).[Method] which was investigated by routine survey and statistical methods of fish parasites.[Result] The total infection rate was 79.4; and the mean infection intensity was 14.83 ± 13.56.The infection rate of different body length groups increased linearly with the host length,while the mean infection intensity and the mean infection abundance presented the first increase and then decrease trend.[Conclusion] The special state of parasitic infection and the aggregation distribution of the parasite population in the host population indicated that the parasite had the lowest impact on the host population structure.The special fish species in the Irtysh River,lota lota compared with other fish species was more susceptible to Diplostomum,and the infection rate with the host body length and age was proportional.The mean infection intensity had significant differences between the two groups (L≤20 cm,25 cm ＜L≤30 cm,30 cm ＜L≤35 cm) at (P ＜0.05).

摘要： [目的]研究额尔齐斯河(中国段)江鳕(Lota lota)眼内寄生的墨氏复口吸虫(Diplostomum.mergi)种群动态特点.[方法]运用鱼类寄生虫常规调查及统计方法,.[结果]墨氏复口吸虫总感染率为79.4;,平均感染强度为14.83±13.56.不同体长组感染率随着宿主体长的增加呈直线上升趋势,而平均感染强度与平均感染丰度呈现先上升后下降的状态.[结论]墨氏复口吸虫寄生宿主特殊状态的呈现,以及虫体种群在宿主种群中的聚集分布,寄生虫对宿主种群结构的影响降到最低.额尔齐斯特有鱼类中,相对于其它鱼种江鳕更易感染复口吸虫,其感染率与宿主体长和年龄成正比.平均感染强度中L≤20 cm与25 cm ＜L≤30 cm、30 cm ＜L≤35 cm两个体长组之间差异显著(P＜0.05).