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      2021年浙江省寧波市南美白對蝦養殖期EHP和DIV1病原監測

      4 2022-09-21 15:24:20 王雯瓊,柳海,徐勝威等 《中國動物檢疫》2022年第8期

      為了解浙江省寧波市南美白對蝦主養區蝦肝腸胞蟲(EHP)、十足目虹彩病毒1(DIV1)的流行規律,2021年3—9月,在寧波市鄞州、象山、寧海、奉化等地區的15個養殖場共采集119批次南美白對蝦養成期樣本,采用PCR方法檢測EHP和DIV1。結果顯示:EHP批次陽性率為26.9%(32/119),DIV1批次陽性率為10.9%(13/119),EHP+DIV1混合感染批次陽性率為2.5%(3/119);EHP批次陽性率在各個養殖區域之間差異不顯著(P>0.05),象山的DIV1批次陽性率最高,為30.4%(7/23),顯著高于奉化(P<0.05),但與其他兩地差異不顯著(P>0.05);EHP批次陽性率在體長3 cm以上的蝦樣中顯著高于小于3 cm的蝦樣(P<0.05),而DIV1批次陽性率在不同體長對蝦中均無顯著差異(P>0.05);EHP批次陽性率4—5月顯著低于6—9月(P<0.05),DIV1批次陽性率7—8月顯著高于其他月份(P<0.05);EHP在體表發紅癥狀的批次中未檢出,在其余癥狀的批次中均有檢出,DIV1在有體表發紅癥狀的批次中陽性率較高,為91.0%(10/11)。結果表明:EHP在寧波市流行嚴重,主要流行于體長大于3 cm的養殖中后期對蝦,前期感染癥狀不明顯;DIV1流行得到一定的控制,現主要流行于體長3~6 cm的對蝦,體表發紅是DIV1感染的重要病癥;兩種病原在夏季都有較強的流行趨勢,需針對性加強防控。本監測初步掌握了寧波市南美白對蝦中EHP和DIV1的流行規律,為寧波市南美白對蝦病害防控提供了參考。

      Etiological Surveillance for EHP and DIV1 in Penaeus vannamei in Ningbo City of Zhejiang Province in 2021

      In order to find out the prevalence rules of Enterocytozoon hepatopenaei(EHP)and decapod iridescent virus1(DIV1)in Penaeus vannamei in the main breeding area in Ningbo City,from March to September 2021,119 batches of Penaeus vannamei samples were collected from 15 farms in Yinzhou,Xiangshan,Ninghai and Fenghua in Ningbo City to detect EHP and DIV1 by PCR. The results showed that the batch positive rate of EHP was 26.9%(32/119),the batch positive rate of DIV1 was 10.9%(13/119),and that of mixed infection with EHP+DIV1 was 2.5%(3/119);that of EHP was not significantly different among each area(P>0.05)and that of DIV1 was highest in Xiangshan,which was 30.4%(7/23)and higher than that in Fenghua(P<0.05),but slightly different from the other two regions(P>0.05);the positive rate of EHP was significantly higher in shrimp samples with the body length>3 cm than in those<3 cm(P<0.05),while that of DIV1 was not significantly different in those with different body lengths;that of EHP from April to May was significantly lower than that from June to September(P<0.05),and that of DIV1 from July to August was significantly higher than other months(P<0.05);except the batches with the symptom of reddening on body surface,EHP was detected from those with other symptoms,and the positive rate of DIV1 was higher in those with the symptom of reddening on body surface,which was 91.0%(10/11). In conclusion,EHP was seriously prevalent in Ningbo City,especially in the shrimps with the body length > 3 cm,but with slightly infection sympoms at early stage;DIV1 was controlled to certain extent,and now mainly in the shrimps with body length ranging from 3 to 6 cm,with main symptom of reddening on body surface;both pathogens were strongly prevalent in summer,which should be targetedly prevented and controlled. The prevalence rules of EHP and DIV1 in Penaeus vannamei were primarily investigated,which provided a reference for disease prevention and control of Penaeus vannamei in Ningbo City.

      原文鏈接:https://kns.cnki.net/kcms/detail/detail.aspx?dbcode=CJFD&dbname=CJFDAUTODAY&filename=ZGDW202208007&uniplatform=NZKPT&v=vPzqR5W2eDBmoUOTyz34-l1e5KVMeeM2-O448Ocd7pL4ZBYBJRKHkyKcF9jBmJ1-

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