{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T10:04:31Z","timestamp":1784887471452,"version":"3.55.0"},"reference-count":55,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T00:00:00Z","timestamp":1773705600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T00:00:00Z","timestamp":1773705600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100007665","name":"Save Our Seas Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100007665","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100002861","name":"Explorers Club","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100002861","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Fish Biology"],"published-print":{"date-parts":[[2026,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Pigmentation is a key functional trait influencing camouflage, predator\u2013prey interactions and energetic efficiency in marine organisms, yet its physiological and ecological consequences remain poorly understood in deep\u2010sea sharks. Here, we describe a deep\u2010sea shark (\n                    <jats:italic>Heptranchias perlo<\/jats:italic>\n                    ) exhibiting a mosaic pigmentation disorder characterized by the coexistence of hypermelanotic, hypopigmented and amelanotic regions, indicating disruption of normal melanophore distribution and regulation. Histological examination revealed no structural or inflammatory abnormalities, supporting a non\u2010pathological origin of the pigmentation anomaly. In contrast, condition indices indicated pronounced energetic depletion, with reduced condition factor and hepatosomatic index, while lipid extraction and Fourier\u2010transform infrared and ultraviolet\u2013visible spectroscopy revealed substantial depletion and altered composition of hepatic lipid reserves consistent with chronic negative energy balance relative to phenotypically normal conspecifics. We propose that disruption of countershading in hexanchiform sharks may reduce camouflage efficiency and increase energetic costs, contributing to the observed physiological compromise in sharks. Despite being based on a single individual, this integrative analysis links pigmentation anomalies to functional and energetic consequences, and underscores the need to move beyond descriptive accounts toward mechanistic assessments of coloration in marine predators, particularly in deep\u2010sea elasmobranchs that are inherently rarely encountered.\n                  <\/jats:p>","DOI":"10.1111\/jfb.70387","type":"journal-article","created":{"date-parts":[[2026,3,17]],"date-time":"2026-03-17T09:35:56Z","timestamp":1773740156000},"page":"210-219","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A complex pigmentation disorder reveals energetic and ecological costs of coloration in a deep\u2010sea sharpnose sevengill shark"],"prefix":"10.1111","volume":"109","author":[{"given":"Glorimar","family":"Franqui\u2010Rivera","sequence":"first","affiliation":[{"name":"Department of Marine Sciences University of Puerto Rico  Mayag\u00fcez Puerto Rico"},{"name":"Sharklab ADRIA: Center for marine and freshwater biology  Vlor\u00eb Albania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0839-3940","authenticated-orcid":false,"given":"Joel H.","family":"Gayford","sequence":"additional","affiliation":[{"name":"Department of Marine Biology &amp; Aquaculture James Cook University  Townsville Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noemy","family":"Pe\u00f1a","sequence":"additional","affiliation":[{"name":"Fisheries Research Laboratory Department of Environmental and Natural Resources  Cabo Rojo Puerto\u00a0Rico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nikolaos V.","family":"Schizas","sequence":"additional","affiliation":[{"name":"Department of Marine Sciences University of Puerto Rico  Mayag\u00fcez Puerto Rico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nina","family":"Tomi\u0107","sequence":"additional","affiliation":[{"name":"Sharklab ADRIA: Center for marine and freshwater biology  Vlor\u00eb Albania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5138-9368","authenticated-orcid":false,"given":"Andrej A.","family":"Gaji\u0107","sequence":"additional","affiliation":[{"name":"Sharklab ADRIA: Center for marine and freshwater biology  Vlor\u00eb Albania"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,3,17]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00300-008-0500-6"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/1438-9312(200201)104:1<59::AID-EJLT59>3.0.CO;2-I"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1093\/icb\/23.2.347"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/jai.14326"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1017\/S1755267205001156"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1366\/0003702001950742"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1523-1747.2001.01262.x"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1007\/s41208-024-00791-2"},{"key":"e_1_2_9_10_1","first-page":"17","article-title":"Unusual and substantiated records of Heptranchias perlo (Chondrichthyes: Hexanchidae) in the NE Tunisian waters (central Mediterranean Sea)","volume":"40","author":"Capap\u00e9 C.","year":"2018","journal-title":"Thalassia Salentina"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1641\/0006-3568(2005)055[0125:TASOCI]2.0.CO;2"},{"issue":"2","key":"e_1_2_9_12_1","first-page":"229","article-title":"Capture of a juvenile sharpnose sevengill shark, Heptranchias perlo (Bonnaterre, 1788), from the Turkish coast (eastern Mediterranean Sea) with updated records from Mediterranean waters","volume":"34","author":"\u00c7evik C.","year":"2024","journal-title":"Annales. 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