{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,7,8]],"date-time":"2025-07-08T08:10:07Z","timestamp":1751962207938,"version":"3.41.2"},"reference-count":44,"publisher":"Cambridge University Press (CUP)","license":[{"start":{"date-parts":[[2025,7,8]],"date-time":"2025-07-08T00:00:00Z","timestamp":1751932800000},"content-version":"unspecified","delay-in-days":188,"URL":"https:\/\/www.cambridge.org\/core\/terms"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Helminthol."],"published-print":{"date-parts":[[2025]]},"abstract":"<jats:title>Abstract<\/jats:title>\n\t  <jats:p>Data on the infection of Middendorff\u02bcs eelpout, <jats:italic>Hadropareia middendorffii<\/jats:italic>, by metacercariae of the trematodes <jats:italic>Cryptocotyle lingua<\/jats:italic> Creplin, 1825 and <jats:italic>Liliatrema skrjabini<\/jats:italic> Gubanov, 1953, which are causative agents of black spot disease, is provided here for the first time for Taui Bay, Sea of Okhotsk. The prevalence of infection of fish by larvae of <jats:italic>C. lingua<\/jats:italic> reached 79%, while the intensity of infection varied from one to 278 individuals (with an average of 53). The prevalence of infection by <jats:italic>L. skrjabini<\/jats:italic> was lower (40%), with an intensity from one to 22 larvae (on average, eight). Metacercariae of both trematode species were surrounded by two envelopes: an outer, connective tissue capsule formed by the host\u2019s cells, and an inner cyst formed by the parasite. The examined metacercariae were found in all regions of the fish\u2019s body (head, trunk, and fins), with approximately equal numbers of individuals of both species found in tissues of the head and trunk regions. Metacercariae of <jats:italic>C. lingua<\/jats:italic> were localised in the fishes\u2019 muscles, not only immediately under the skin but also in deeper layers. The capsules formed around metacercariae of both trematode species were dominated by fibroblasts and collagen fibres and did not show pronounced signs of inflammation. Studying the distribution of black spot disease and its effects on fish is crucial for understanding disease patterns in relation to fish population dynamics. It may also inform the development of effective anthelmintic treatments for use in aquaculture farms.<\/jats:p>","DOI":"10.1017\/s0022149x25100461","type":"journal-article","created":{"date-parts":[[2025,7,8]],"date-time":"2025-07-08T07:52:04Z","timestamp":1751961124000},"source":"Crossref","is-referenced-by-count":0,"title":["Causative agents of black spot disease in Middendorff\u2019s eelpout, <i>Hadropareia middendorffii<\/i> (Teleostei: Zoarcidae), from the Sea of Okhotsk"],"prefix":"10.1017","volume":"99","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9497-584X","authenticated-orcid":false,"given":"E.","family":"Skorobrekhova","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"56","published-online":{"date-parts":[[2025,7,8]]},"reference":[{"key":"S0022149X25100461_r23","doi-asserted-by":"publisher","DOI":"10.2307\/3281395"},{"key":"S0022149X25100461_r35","unstructured":"Pulsford, A (1980) Pathology of parasitic infections in marine teleosts. 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