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首页> 外文期刊>Journal of Parasitology >Seasonal Occurrence of Helminths in the Anadromous Fish Coilia nasus (Engraulidae): Parasite Indicators of Fish Migratory Movements
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Seasonal Occurrence of Helminths in the Anadromous Fish Coilia nasus (Engraulidae): Parasite Indicators of Fish Migratory Movements

机译：正常鱼类Co虫（Engraulidae）中蠕虫的季节性发生：鱼类迁移运动的寄生指标

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摘要

To understand the seasonal migration of the anadromous Coilia nasus, we attempted to identify the parasites infecting C. nasus and determine their seasonal occurrence. From June 2007 to July 2008, a survey of 775 C. nasus individuals from the estuary of the Yangtze River and the coast of the East China Sea revealed more than 7,300 parasites associated with the gills and alimentary tracts of C. nasus. The following 6 helminth taxa were identified, i.e., the monogeneans Heteromazocraes lingmueni and Helciferus tenuis, the digenean Elytrophallus coiliae, the acanthocephalan Acanthosentis cheni, and larvae of the nematodes Anisakis simplex and Contracaecum sp., all of which are marine or brackish-water parasites. The absence of freshwater helminths suggested that the parasites acquired in freshwater may have been accidentally, and easily, lost by the time the fish had reached the estuary and coast. Contrary to seasonal occurrence of the parasites' life cycles, the lowest mean abundance and prevalence of H. lingmueni and A. cheni occurred in August, which suggested the immigration of C. nasus from freshwater to the Yangtze estuary, with lower parasite burdens. The highest mean abundance and prevalence of the nematodes A. simplex and Contracaecum sp. in May and June, and the lowest in August, indicated the arrival of the fish from the coast and the Yangtze River, to the estuary, respectively. These findings suggested that a majority of the fish prepared for spawning migration in the estuary in spring and early summer and returned to the estuary after spawning in the lower and middle reaches of the Yangtze River in late summer.
机译：为了了解无性Co虫鼻的季节性迁徙，我们试图确定感染鼻息肉的寄生虫并确定其季节性发生。从2007年6月到2008年7月，对来自长江口和东海沿岸的775例鼻C的调查显示，有7,300多种与鼻C的and和消化道有关的寄生虫。鉴定出以下6种蠕虫类群，即单属的杂种杂种lingmueni和Helciferus tenuis，双属的Elytrophallus coiliae，棘头动物的Acanthosentis cheni和线虫Anisakis simplex和Contracaecum sp。的幼虫，都是海洋生物或。淡水蠕虫的缺乏表明，在鱼到达河口和海岸时，淡水中捕获的寄生虫可能偶然而容易地丢失了。与寄生虫生命周期的季节性变化相反，H。lingmueni和A. cheni的平均丰度和患病率最低，发生在8月，这表明C. nasus从淡水向长江口的迁移，具有较低的寄生虫负担。线虫A. simplex和Contracaecum sp。的平均丰度和患病率最高。 5月和6月，以及8月的最低点，分别表示鱼从沿海和长江到达河口。这些发现表明，大部分准备在春季和夏季初在河口产卵的鱼类，并在夏季后期在长江中下游产卵后返回到河口。

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