西白令海狭鳕肝脏异尖线虫感染特性的影响因素分析

Factors impacting infection characteristics of Anisakis sp. in liver of walleye pollock (Gadus chalcogrammus) in the western Bering Sea

狭鳕(Gadus chalcogrammus)为白令海至北太平洋海域最为重要的商业性鱼种,也是生态系统中关键鱼种。异尖线虫为狭鳕体内,尤其是肝脏,最为常见的寄生虫。为探究狭鳕肝脏寄生虫感染情况及其影响因素,本研究对2019年6—8月西白令海狭鳕肝脏中异尖线虫(Anisakis sp.)感染状况进行了分析,并利用广义线性模型(generalized linear model, GLM)解释了异尖线虫感染特性的因素。结果显示,西白令海狭鳕肝脏异尖线虫感染程度较高,感染率为93.3%,雄性和雌性狭鳕感染强度差异不显著;异尖线虫感染强度随着体长和采样点经度的增加而增加,随着采样点时间的推移而减小。研究结果为西白令海狭鳕与其寄生虫的生物学特性的研究提供科学信息,为北太平洋食物网结构研究提供基础数据。

Walleye pollock(Gadus chalcogrammus) is the most important commercial fish species in the waters through the Bering Sea to the North Pacific Ocean, and is the keystone species in the ecosystem of this region. Anisakis sp. is the common parasite in walleye pollock, particularly in the liver of this species. Therefore, In order to explore infection of Anisakis sp. to liver of walleye pollock and the factors that affect this process, this study analyzed infection of Anisakis sp. to liver of walleye pollock in the western Bering Sea and explained the factors that impact infection of Anisakis sp. to liver of walleye pollock using generalized linear model. The results indicated that the infection intensity was high and reached 93.3%, however, no significant difference could be observed in infection intensity of Anisakis sp. between sexes of host. The infection intensity of Anisakis sp. increased with the increasing of host size and eastern moving of sampling locations, but decreased with the lapse of time in a day. The study provides the scientific information about biology of walleye pollock and Anisakis sp. in the western Bering Sea and provides the basic data for food web structure in the North Pacific Ocean.