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在实验室中对龙江血居吸虫尾蚴感染30min至2h的鲫鱼苗进行组织连续切片,以观察龙江血居吸虫尾蚴对鲫鱼苗的侵入部位。结果显示,龙江血居吸虫尾蚴能从鲫鱼苗（全长:2.5-5.5cm）的鳃丝、鳃弓粘膜、口咽腔粘膜、鼻孔粘膜、鳍膜、头部体表、躯干部体表甚至眼角等部位侵入鲫鱼苗。其中通过口腔（包括鳃丝、鳃弓粘膜、口咽腔粘膜）及头部体表侵入的虫体数量较多,比例分别为46.25％和37.44％。由鳍膜及躯干部侵入的虫体数量较少,比例分别为5.32％和10.98％。
In the laboratory Longjiang blood-sucking cercariae cercariae infection 30min to 2h crucian carp tissue sections were sliced in order to observe Longjiang blood-sucking cercariae on the crucian carp invaded the site. The results showed that the cercariae of Longjiang blood-sucking caterpillar could be obtained from gill filaments, gill filaments, gill arch mucosa, oropharyngeal mucosa, fin membrane, head body surface and trunk body surface of crucian carp (total length: 2.5-5.5cm) Even parts of the eye invade crucian carp seedlings. Among them, the number of parasites invaded through the oral cavity (including gill filaments, gill arch mucosa, oropharyngeal mucosa) and head body surface were quite large with the proportions of 46.25% and 37.44% respectively. The number of parasites invaded by fins and trunk was less, accounting for 5.32% and 10.98% respectively.