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R. Soc. B."],"published-print":{"date-parts":[[2024,10]]},"abstract":"<jats:p>\n            Parasitism involves diverse evolutionary strategies, including adaptations for blood feeding, which provides essential nutrients for growth and reproduction.\n            <jats:italic>Sparicotyle chrysophrii<\/jats:italic>\n            (Polyopisthocotyla: Microcotylidae), an ectoparasitic flatworm, infects the gills of gilthead seabream (\n            <jats:italic>Sparus aurata<\/jats:italic>\n            ), significantly affecting fish health, welfare and Mediterranean cage farm profitability. Despite its impact, limited information exists on its feeding behaviour. This study demonstrates the presence of blood and exogenous haem groups in\n            <jats:italic>S. chrysophrii<\/jats:italic>\n            and explores its digestive tract using light and electron microscopy, elucidating its internal morphology and spatial arrangement. Elemental analysis of the digestive haematin cells shows residual oxidized haem depots as haematin crystals. Additionally, we studied the impact of the blood feeding on the host by estimating the average volume of blood intake for an adult parasite (2.84 \u00b1 2.12\u00b5l\u00b724h\n            <jats:sup>\u20131<\/jats:sup>\n            ) and we described the significant drop of the plasmatic free iron levels in infected hosts. Overall, we demonstrate the parasite\u2019s reliance on its host blood, the parasite\u2019s buccal and digestive morphological adaptations for blood feeding and the provoked effect on the fish host's health.\n          <\/jats:p>","DOI":"10.1098\/rspb.2024.1611","type":"journal-article","created":{"date-parts":[[2024,10,30]],"date-time":"2024-10-30T13:21:24Z","timestamp":1730294484000},"update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Hooked on fish blood: the reliance of a gill parasite on haematophagy"],"prefix":"10.1098","volume":"291","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9541-4382","authenticated-orcid":true,"given":"Enrique","family":"Riera-Ferrer","sequence":"first","affiliation":[{"name":"Fish Pathology Group, Institute of Aquaculture Torre de la Sal (IATS, CSIC), Consejo Superior de Investigaciones Cient\u00edficas, Castell\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6218-2191","authenticated-orcid":true,"given":"Itziar","family":"Estensoro","sequence":"additional","affiliation":[{"name":"Fish Pathology Group, Institute of Aquaculture Torre de la Sal (IATS, CSIC), Consejo Superior de Investigaciones Cient\u00edficas, Castell\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Beatriz","family":"L\u00f3pez-Gurillo","sequence":"additional","affiliation":[{"name":"Fish Pathology Group, Institute of Aquaculture Torre de la Sal (IATS, CSIC), Consejo Superior de Investigaciones Cient\u00edficas, Castell\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Raquel","family":"Del Pozo","sequence":"additional","affiliation":[{"name":"Fish Pathology Group, Institute of Aquaculture Torre de la Sal (IATS, CSIC), Consejo Superior de Investigaciones Cient\u00edficas, Castell\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4029-2792","authenticated-orcid":true,"given":"Francisco Esteban","family":"Montero","sequence":"additional","affiliation":[{"name":"Cavanilles Institute for Biodiversity and Evolutionary Biology, Science Park, University of Valencia, Valencia 46071, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7473-3413","authenticated-orcid":true,"given":"Ariadna","family":"Sitj\u00e0-Bobadilla","sequence":"additional","affiliation":[{"name":"Fish Pathology Group, Institute of Aquaculture Torre de la Sal (IATS, CSIC), Consejo Superior de Investigaciones Cient\u00edficas, Castell\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7702-6098","authenticated-orcid":true,"given":"Oswaldo","family":"Palenzuela","sequence":"additional","affiliation":[{"name":"Fish Pathology Group, Institute of Aquaculture Torre de la Sal (IATS, CSIC), Consejo Superior de Investigaciones Cient\u00edficas, Castell\u00f3n, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"175","published-online":{"date-parts":[[2024,10,30]]},"reference":[{"key":"e_1_3_8_2_2","doi-asserted-by":"publisher","DOI":"10.1186\/1756-3305-3-108"},{"key":"e_1_3_8_3_2","doi-asserted-by":"publisher","DOI":"10.1006\/abbi.1993.1566"},{"key":"e_1_3_8_4_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.cub.2023.08.064"},{"key":"e_1_3_8_5_2","doi-asserted-by":"publisher","DOI":"10.3390\/tropicalmed8010059"},{"key":"e_1_3_8_6_2","doi-asserted-by":"publisher","DOI":"10.1017\/S0031182014000808"},{"key":"e_1_3_8_7_2","doi-asserted-by":"publisher","DOI":"10.2331\/suisan.44.1315"},{"key":"e_1_3_8_8_2","doi-asserted-by":"publisher","DOI":"10.3354\/dao058171"},{"key":"e_1_3_8_9_2","first-page":"139","article-title":"High infection by Zeuxapta seriolae (Monogenea: Heteraxinidae) associated with mass mortalities of amberjack Seriola dumerili Risso reared in sea cages in the Balearic islands (western Mediterranean)","volume":"23","author":"Grau A","year":"2003","unstructured":"Grau A, Crespo S, Pastor E, Gonz\u00e1lez P, Carbonell E. 2003 High infection by Zeuxapta seriolae (Monogenea: Heteraxinidae) associated with mass mortalities of amberjack Seriola dumerili Risso reared in sea cages in the Balearic islands (western Mediterranean). 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