Szalai A J, Dick T A
Department of Zoology, University of Manitoba, Winnipeg, Canada.
J Parasitol. 1990 Aug;76(4):598-601.
Nonresident (introduced) largemouth bass (Micropterus salmoides) from Boundary Reservoir, Saskatchewan were examined for helminths. Four species of parasites were found (Diplostomum sp., Proteocephalus ambloplitis, Pomphorhynchus bulbocolli, and Contracaecum sp.). Contracaecum sp. larvae were absent in age-0 and age-1 bass, but prevalence and mean intensity increased with age for bass age-2 or older. Similarly, the prevalence and mean intensity of P. ambloplitis plerocercoids in bass were low until age-2; older bass harbored significantly more plerocercoids. Analysis of stomach contents indicates that this pattern of recruitment for Contracaecum sp. and P. ambloplitis is probably due to increased feeding by largemouth bass on aquatic insects and cannibalism after age-2, respectively. Although Contracaecum sp. may have been established in the reservoir prior to the introduction of bass, we are certain that P. ambloplitis was introduced via stocking with infected fingerlings.
对来自萨斯喀彻温省边界水库的外来（引入的）大口黑鲈（Micropterus salmoides）进行了寄生虫检查。发现了四种寄生虫（复口吸虫属、钝吻头槽绦虫、球茎吻棘头虫和对盲囊线虫属）。0龄和1龄鲈鱼体内没有对盲囊线虫属幼虫，但2龄及以上鲈鱼的感染率和平均感染强度随年龄增加。同样，鲈鱼体内钝吻头槽绦虫裂头蚴的感染率和平均感染强度在2龄之前较低；年龄较大的鲈鱼体内裂头蚴明显更多。对胃内容物的分析表明，对盲囊线虫属和钝吻头槽绦虫的这种感染模式可能分别是由于大口黑鲈在2龄后对水生昆虫的摄食增加和同类相食。虽然对盲囊线虫属可能在鲈鱼引入之前就已在水库中存在，但我们确定钝吻头槽绦虫是通过投放受感染的幼鱼引入的。
