Abstract: Objective　To investigate the populations of freshwater crabs, the intermediate host of Paragonimus and Paragonimus infections in freshwater crabs in the Minjiang River basin along the middle section of Wuyi Mountain, so as to provide baseline data for parasitic disease control and research and expansion of the parasite resource bank. Methods　From November 2020 to April 2021, freshwater crabs were sampled from streams and ditches neighboring residential areas in Jianning County and its neighboring Ninghua, Shaowu, Jiangle and Shunchang counties. The crab species was identified based on the morphological features of the terminal segment of the first abdominal appendage of male crabs, and Paragonimus infections were detected in freshwater crabs. The Paragonimus metacercariae were isolated, and the types of metacercariae were identified based on the metacercaria size, cystic wall thickness, and the excretory bladder and intestinal tract morphology. In addition, the prevalence, intensity and index of metacercaria infections were calculated in freshwater crabs. Results　There were seven crab species found in Jianning County and six neighboring water systems along the Minjiang River basin, including Sinopotamon jianglense, S. fukinense, Huananpotamon lichuanense, H. lini, H. shenni, H. planopodum, Bottapotamon engelhardti, and there were metacercariae of three Paragonimus species detected in these crabs, including P. westermani, P. skrjabini and P. sanpingensis, with a prevalence rate of 43.6% (125/287). The infection rates of P. westermani, P. sanpingensis and P. skrjabini were 57.1% (48/84), 26.2% (22/84) and 61.8% (21/34) in S. jianglense, and the infection rates of P. westermani and P. sanpingensis were 52.6% (51/97) and 30.9% (30/97) in S. fukinense, while the rate of P. westermani infection was 6.9% (5/72) in H. lichuanense, which is the first record of P. westermani infections in H. lichuanense. Mixed P. westermani and P. sanpingensis infections were predominantly found in freshwater crabs sampled from Jianning County, where the rate of Paragonimus infections was 70.4% (76/108), with 15.3 metacercariae identified in each crab with Paragonimus infections and 1.9 metacercariae found in each gram of crabs with Paragonimus infections, and the index of metacercariae infections was 20.5. In addition, P. westermani, P. skrjabini and P. sanpingensi metacercariae were found in freshwater crabs sampled from Jianning⁃neighboring counties, where the rate of Paragonimus infections was 52.3% (56/107), with 9.8 metacercariae identified in each crab with Paragonimus infections and 0.9 metacercariae found in each gram of crabs with Paragonimus infections, and the index of metacercariae infections was 4.6. Conclusion　There are multiple freshwater crab species and Paragonimus infection is high in freshwater crabs in Jianning County and its neighboring Minjiang River basin, which is a high⁃risk natural focus for Paragonimus infections.

Key words: Paragonimus, Freshwater crab, Minjian River basin

摘要： 目的　调查武夷山中段闽江流域并殖吸虫中间宿主蟹类种群及其感染情况，为寄生虫病防治研究和寄生虫资源库样本扩充提供基础资料。方法　2020年11月—2021年4月，在武夷山山脉沙溪和富屯溪闽江水系的建宁县及其周边宁化、邵武、将乐、顺昌县开展调查，选择居民区附近山涧水沟采集溪蟹标本。根据雄蟹第一腹肢末节形态特征进行蟹种鉴定，采用直接压片法、双筛法检测捕获的溪蟹并殖吸虫感染。分离并殖吸虫囊蚴，根据囊蚴大小、囊壁厚薄和排泄囊及肠管形态鉴定囊蚴种类，并计算溪蟹囊蚴感染率、感染度和感染指数。结果　建宁县及周边闽江流域6条水系存在将乐华溪蟹、福建华溪蟹、黎川华南溪蟹、林氏华南溪蟹、沈氏华南溪蟹、平肢华南溪蟹、恩氏博特溪蟹等7种溪蟹分布，在蟹体内检出卫氏并殖吸虫、斯氏并殖吸虫和三平正并殖吸虫囊蚴，并殖吸虫囊蚴感染率为43.6%（125/287）。将乐华溪蟹卫氏并殖吸虫、三平正并殖吸虫、斯氏并殖吸虫囊蚴感染率分别为57.1%（48/84）、26.2%（22/84）、61.8%（21/34）；福建华溪蟹卫氏并殖吸虫、三平正并殖吸虫囊蚴感染率分别为52.6%（51/97）和30.9%（30/97）；黎川华南溪蟹卫氏并殖吸虫囊蚴感染率为6.9%（5/72），此为该蟹卫氏并殖吸虫感染首次记录。建宁县调查点溪蟹多为卫氏并殖吸虫和三平正并殖吸虫囊蚴混合感染，并殖吸虫感染率为70.4%（76/108），平均每只感染溪蟹检出囊蚴15.3个、平均每克溪蟹检出囊蚴1.9个，囊蚴感染指数为20.5。建宁县周边调查点溪蟹体内检出卫氏并殖吸虫、三平正并殖吸虫和斯氏并殖吸虫囊蚴，溪蟹并殖吸虫囊蚴感染率为52.3%（56/107），平均每只感染溪蟹检出囊蚴9.8个、平均每克溪蟹检出囊蚴0.9个，囊蚴感染指数为4.6。结论　建宁县及周边闽江流域蟹类种群资源丰富，且并殖吸虫囊蚴感染率高，为高度感染风险的并殖吸虫病自然疫源地。

关键词: 并殖吸虫, 溪蟹, 闽江流域