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It is a target or by\u2010catch species in multiple fisheries, and as a result, rapid population declines have occurred in many regions. These declines have contributed to the species being assessed as globally critically endangered on the IUCN Red List. Although conservation and management measures have yielded promising results in some regions, such as the United States, high levels of at\u2010vessel and post\u2010release mortality remain a major concern to the species population recovery. This examined the vertical space use and thermal range of pop\u2010off archival satellite\u2013tagged <jats:italic>S. mokarran<\/jats:italic> in the western North Atlantic Ocean, expanding the understanding of the ecological niche of this species and providing insight into by\u2010catch mitigation strategies for fisheries managers. The results showed that <jats:italic>S. mokarran<\/jats:italic> predominantly used shallow depths (75% of records &lt;30\u2009m) and had a narrow temperature range (89% of records between 23 and 28\u00b0C). Individual differences in depth use were apparent, and a strong diel cycle was observed, with sharks occupying significantly deeper depths during the daytime. Furthermore, two individuals were confirmed pregnant with one migrating from the Bahamas to South Carolina, U.S.A., providing further evidence of regional connectivity and parturition off the U.S. East Coast. The findings suggest that <jats:italic>S. mokarran<\/jats:italic> may be vulnerable to incidental capture in the western North Atlantic commercial longline fisheries due to substantial vertical overlap between the species and the gear. The results can be incorporated into conservation and management efforts to develop and\/or refine mitigation measures focused on reducing the by\u2010catch and associated mortality of this species, which can ultimately aide <jats:italic>S. mokarran<\/jats:italic> population recovery in areas with poor conservation status.<\/jats:p>","DOI":"10.1111\/jfb.15185","type":"journal-article","created":{"date-parts":[[2022,8,5]],"date-time":"2022-08-05T08:34:55Z","timestamp":1659688495000},"page":"797-810","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Vertical space use and thermal range of the great hammerhead (<i>Sphyrna mokarran<\/i>), (R\u00fcppell, 1837) in the western North Atlantic"],"prefix":"10.1111","volume":"101","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6706-1452","authenticated-orcid":false,"given":"Tristan L.","family":"Guttridge","sequence":"first","affiliation":[{"name":"Saving the Blue  Cooper City Florida USA"},{"name":"Bimini Biological Field Station Foundation  South Bimini Bahamas"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lukas","family":"M\u00fcller","sequence":"additional","affiliation":[{"name":"Marine Animal Ecology Group Wageningen University  Wageningen The Netherlands"},{"name":"The Watermen Project  Geneva Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bryan A.","family":"Keller","sequence":"additional","affiliation":[{"name":"Saving the Blue  Cooper City Florida USA"},{"name":"Coastal and Marine Laboratory Florida State University  St. Teresa Florida USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark E.","family":"Bond","sequence":"additional","affiliation":[{"name":"Department of Biological Sciences, Institute of Environment Florida International University  North Miami Florida USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R Dean.","family":"Grubbs","sequence":"additional","affiliation":[{"name":"South Carolina Department of Natural Resources Marine Resources Research Institute  Charleston South Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Winram","sequence":"additional","affiliation":[{"name":"The Watermen Project  Geneva Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucy A.","family":"Howey","sequence":"additional","affiliation":[{"name":"Biosciences, College of Life and Environmental Sciences University of Exeter  Exeter UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bryan S.","family":"Frazier","sequence":"additional","affiliation":[{"name":"South Carolina Department of Natural Resources Marine Resources Research Institute  Charleston South Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel H.","family":"Gruber","sequence":"additional","affiliation":[{"name":"Bimini Biological Field Station Foundation  South Bimini Bahamas"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,9,2]]},"reference":[{"key":"e_1_2_7_2_1","unstructured":"Appendices I and II of the Convention on the Conservation of Migratory Species of Wild Animals (CMS). 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