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We used histopathology and external examination of 140 and external examination only of 310 underyearling suckers collected in 2013, 2015 and 2016 to document pathological changes, particularly those relating to parasites. The most severe infection was caused by a <jats:italic>Contracaecum<\/jats:italic> sp., infecting the atrium of 8%\u201333% of Shortnose Suckers. The most prevalent infections were caused by <jats:italic>Bolbophorus<\/jats:italic> sp. metacercariae in the muscle of Shortnose Suckers (21%\u201363%) and <jats:italic>Lernaea cyprinacea<\/jats:italic> in the skin and muscle of Lost River Suckers (30%\u201381%). Histology detected <jats:italic>Bolbophorus<\/jats:italic> in only 5% of cases where it was not seen externally. Three myxozoans were observed; a <jats:italic>Parvicapsula<\/jats:italic> sp. in the renal tubules (10%), a <jats:italic>Myxobolus<\/jats:italic> sp. in the intestinal mucosa (2%) and an unusual multicellular, presporogonic myxozoan in the intestinal lumen of one sucker. Severe gill epithelial hyperplasia was observed in several fish collected in 2016. Trichodinids and <jats:italic>Ichthyobodo<\/jats:italic> sp. were observed on some of the gills, but absent in many of the fish with severe lesions. A histiocytic sarcoma was observed in sucker.<\/jats:p>","DOI":"10.1111\/jfd.12875","type":"journal-article","created":{"date-parts":[[2018,8,9]],"date-time":"2018-08-09T07:46:45Z","timestamp":1533800805000},"page":"1675-1687","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Histopathology and external examination of heavily parasitized Lost River Sucker <i>Deltistes luxatus<\/i> (Cope 1879) and Shortnose Sucker <i>Chasmistes brevirostris<\/i> (Cope 1879) from Upper Klamath Lake, Oregon"],"prefix":"10.1111","volume":"41","author":[{"given":"Andrew J","family":"Janik","sequence":"first","affiliation":[{"name":"Department of Microbiology Oregon State University Corvallis Oregon"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Douglas F","family":"Markle","sequence":"additional","affiliation":[{"name":"Department of Fisheries and Wildlife Oregon State University Corvallis Oregon"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jerry R","family":"Heidel","sequence":"additional","affiliation":[{"name":"Oregon Veterinary Diagnostic Laboratory and Department of Biomedical Science Carlson College of Veterinary Medicine Oregon State University Corvallis Oregon"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7968-5142","authenticated-orcid":false,"given":"Michael L","family":"Kent","sequence":"additional","affiliation":[{"name":"Department of Microbiology Oregon State University Corvallis Oregon"},{"name":"Oregon Veterinary Diagnostic Laboratory and Department of Biomedical Science Carlson College of Veterinary Medicine Oregon State University Corvallis Oregon"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2018,8,9]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0041-0101(93)90404-7"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1645\/GE-781R.1"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.7589\/0090-3558-27.2.206"},{"key":"e_1_2_6_5_1","doi-asserted-by":"crossref","unstructured":"Burdick S. 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