Nematode infection status and temporal characteristic of estuarine tapertail anchovy Coilia nasus in Anqing section of the Yangtze River
DAI Pei,GUO Qi,TIAN Jiali1,MA Fengjiao,WANG Yinping,LIU Kai*
1.Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization,Ministry of Agriculture and Rural Affairs,Freshwater Fisheries Research Center,Chinese Academy of Fishery Sciences，Wuxi 214081,China;2.Freshwater Fisheries Research Institute of Jiangsu Province,Nanjing 210017,China；3.Fisheries College of Wuxi,Nanjing Agricultural University,Wuxi 214081,China
Abstract: In order to grasp nematode infection status of estuarine tapertail anchovy Coilianasus in the Yangtze River,the nematode infection was surveyed in 1 658 samples of C.nasus collected at the Anqing section of the Yangtze River from April to July 2018 for 72 d.The results showed that the infection rate of the whole samples was 96.32%,the average infection intensity was (10.69±9.67)individuals per fish,the average infection abundance was (10.16±9.67) individuals per fish.In the infected C.nasus,52.53% of individuals were infected with 1-9 nematodes,and a few fish infected with nematodes more than 30,accounting for only 3.93%.Nematodes are parasitic on the body cavity and organs of C.nasus,including the stomach,pyloric caecum,and intestinal tract.The gonads and liver are attached to the surface or embedded in the tissue.There was the maximal nematodes in intestine and pyloric caecum,and the proportions nematodes were 41.26%,and 31.15% respectively.The results of nematode sampling and identification showed that C.nasus was infected with 6 species of 2 genera,including 2 species of Anisakis and 4 species of Hysterothylacium,the dominant species is Anisakispegreffii.The infection intensity of C.nasus in different sizes was different.With increase in body length,the infection intensity of C.nasus showed a trend of increasing first and then decreasing.The infection rate was the highest in the body length group of 280-300 mm,and the average intensity and abundance were the highest in the 260-279 mm body length group.In addition,during the investigation period,as time passed,the infection index of C.nasus was first increased and then decreased,and the infection was the most serious in the first half of June.In summary,this study has basically grasped nematode infection status of C.nasus in the Yangtze River,and may have a positive impact on the follow-up study which focused on the impact of nematode parasitism,and the C.nasus population dynamics after infected with nematode.
代培, 郭琦, 田佳丽, 马凤娇, 王银平, 刘凯. 长江安庆段刀鲚的线虫感染现状及时间特征[J]. 大连海洋大学学报, 2022, 37(3): 464-470.
DAI Pei, GUO Qi, TIAN Jiali, MA Fengjiao, WANG Yinping, LIU Kai. Nematode infection status and temporal characteristic of estuarine tapertail anchovy Coilia nasus in Anqing section of the Yangtze River. Journal of Dalian Ocean University, 2022, 37(3): 464-470.
2022, Vol. 37 
