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However, the species investigation of trichodinids on hybrid yellow catfish is relatively deficient, which seriously hinders the prevention and control of trichodiniasis. Hence, trichodinids were collected in a hybrid yellow catfish farm in Hubei Province from June 2022 to October 2023 and identified by morphological and molecular biology methods. A new species <jats:italic>Tripartiella luhuensis<\/jats:italic> sp. nov. and nine <jats:italic>Trichodina<\/jats:italic> species were described. Phylogenetic analyses demonstrated that <jats:italic>T. luhuensis<\/jats:italic> nested in the <jats:italic>Trichodinella\u2010Tripartiella<\/jats:italic>\u2010<jats:italic>Paratrichodina<\/jats:italic> clade, indicating that the genus <jats:italic>Tripartiella<\/jats:italic> is not a monophyletic group. Besides, Trichodinid species from Siluriformes hosts have relatively similar evolutionary positions. Histopathological analysis revealed that the parasitism of trichodinids caused mechanical damage and mucus hypersecretion to gill of the host. The present study reports trichodinid species on hybrid yellow catfish for the first time and adds one new species to the genus <jats:italic>Tripartiella<\/jats:italic>. We also indicate the importance of preventing and controlling trichodiniasis in hybrid yellow catfish farming.<\/jats:p>","DOI":"10.1111\/jfd.14100","type":"journal-article","created":{"date-parts":[[2025,3,12]],"date-time":"2025-03-12T02:40:16Z","timestamp":1741747216000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["First Investigation of Trichodinid Species (Ciliophora: Trichodinidae) on Farmed Hybrid Yellow Catfish (<i>Tachysurus fulvidraco<\/i>\u2009\u00d7\u2009<i>Tachysurus vachelli<\/i>) in China"],"prefix":"10.1111","volume":"48","author":[{"given":"Enze","family":"Zhang","sequence":"first","affiliation":[{"name":"College of Fisheries Huazhong Agricultural University  Wuhan China"},{"name":"National Aquatic Animal Diseases Para\u2010Reference Laboratory (HZAU)  Wuhan China"},{"name":"Hubei Engineering Technology Research Center for Aquatic Animal Diseases Control and Prevention  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hao","family":"Yang","sequence":"additional","affiliation":[{"name":"College of Fisheries Huazhong Agricultural University  Wuhan China"},{"name":"National Aquatic Animal Diseases Para\u2010Reference Laboratory (HZAU)  Wuhan China"},{"name":"Hubei Engineering Technology Research Center for Aquatic Animal Diseases Control and Prevention  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiao","family":"Tu","sequence":"additional","affiliation":[{"name":"College of Fisheries Huazhong Agricultural University  Wuhan China"},{"name":"National Aquatic Animal Diseases Para\u2010Reference Laboratory (HZAU)  Wuhan China"},{"name":"Hubei Engineering Technology Research Center for Aquatic Animal Diseases Control and Prevention  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1278-4610","authenticated-orcid":false,"given":"Zemao","family":"Gu","sequence":"additional","affiliation":[{"name":"College of Fisheries Huazhong Agricultural University  Wuhan China"},{"name":"National Aquatic Animal Diseases Para\u2010Reference Laboratory (HZAU)  Wuhan China"},{"name":"Hubei Engineering Technology Research Center for Aquatic Animal Diseases Control and Prevention  Wuhan China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,3,3]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF02187051"},{"key":"e_1_2_10_3_1","volume-title":"Theory and Practice of Histological Techniques","author":"Bancroft J. 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