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目的了解广西各地部分水产品中颚口线虫寄生情况及虫种鉴定,为制定广西颚口线虫防治措施提供参考。方法在广西14个县市的自由市场购买采样,收集淡水鱼、黄鳝、泥鳅和蛇等颚口线虫中间宿主和保虫宿主。每份标本分别用人工消化液消化,在体视显微镜下检查并收集虫体。收获的虫体在光学显微镜和电子显微镜下进行形态学观察。结果从2008年至2010年,在广西14个县市自由市场采集并检查水产品共1 622条(尾)。其中淡水鱼244尾、泥鳅820条、蛇130条检查均为阴性,黄鳝中颚口线虫平均感染率为11%(47/428)。在14个市场中有8个市场的黄鳝检出虫体,阳性率最高的宜州为80.9%(17/21)。颚口线虫幼虫在黄鳝体内分布以肌肉最多占全部检获虫数的56.3%,其次为内脏,占38.2%,头部占5.6%。根据观察和测量到的形态特征,鉴定为颚口线虫属中棘颚口线虫第三期幼虫。结论广西大部分地区自由市场黄鳝携带棘颚口线虫第三期幼虫,部分市场黄鳝感染率高达80.9%。对有食生鱼习惯的广西,水产品携带致病性颚口线虫将对当地食品安全和公共卫生提出很大的挑战。
Objective To understand the parasitism and insect species identification of the jaw nematode in some aquatic products throughout Guangxi and provide a reference for the development of the control measures of the jaw jaw nematode in Guangxi. Methods Samples were collected from free markets in 14 counties and cities of Guangxi to collect intermediate host and host of saprophytic nematodes from freshwater fish, eel, loach and snake. Each specimen was digested with artificial digestive juice, and examined under a stereomicroscope to collect parasites. The harvested worms were observed morphologically under light and electron microscopes. Results From 2008 to 2010, a total of 1 622 pieces (tailings) of aquatic products were collected and examined in the free markets of 14 counties in Guangxi. Among them, 244 freshwater fish, 820 loach and 130 snake were negative, and the average infection rate was 11% (47/428) in the eel. Eel was detected in 8 markets in 14 markets, with the highest positive rate being 80.9% (17/21) in Yizhou. The jaw-eared nematode larvae distributed in the body of the eel so as to occupy a maximum of 56.3% of the total number of insects seized, followed by the viscera, accounting for 38.2% and the head 5.6%. Based on the observed and measured morphological characteristics, it was identified as the third larvae of Spodoptera nematode in the genus Jaws. Conclusions The third stage larvae of Sparry’s jaw nematode were carried in the free market eel in most parts of Guangxi. The infection rate of eel in some markets was as high as 80.9%. For Guangxi, which has the habit of eating raw fish, carrying the pathogenic Jaws nematodes with aquatic products will pose a great challenge to the local food safety and public health.