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For deep\u2010pelagic fishes, however, LWR data remain fragmented and unavailable for most species. Here, we present a global synthesis of LWRs for deep\u2010pelagic fishes, consolidating available data into a single harmonised dataset and mapping taxonomic and geographic gaps. We provide the first LWR estimates for seven species and provide additional morphometric information, including extensions of previously reported size ranges and revised estimates based on freshly collected specimens for 23 species. With these additions, 427 LWRs are now available for 227 species, about 15% of recognised deep\u2010pelagic diversity. Coverage remains strongly biased. Small\u2010bodied, vertically migrating species dominate, especially within the Myctophidae, whereas resident species with stable vertical distributions, slower growth and longer lifespans are poorly represented. Geographic coverage is likewise uneven, with the North Atlantic extensively sampled, but the South Atlantic, Indian Ocean and large areas of the Pacific still severely undersampled. On average, the allometric exponent\n                    <jats:italic>b<\/jats:italic>\n                    was close to isometry (median 3.09), though most individual relationships departed significantly from it, and it was only weakly structured across taxa. Variation among families and body shapes was modest and broadly overlapping because the apparent body\u2010shape gradient in\n                    <jats:italic>b<\/jats:italic>\n                    largely tracked taxonomy. The dominant signal was intraspecific. Within a species,\n                    <jats:italic>b<\/jats:italic>\n                    varied almost as much as it did among species, often by more than a full unit across independent studies. Consequently, a single LWR should not be regarded as a fixed species trait. Length\u2010to\u2010mass conversion should preferentially rely on locally derived relationships wherever they exist, and when relationships must be borrowed from elsewhere, this additional uncertainty should be explicitly acknowledged.\n                  <\/jats:p>","DOI":"10.1111\/jfb.70673","type":"journal-article","created":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T04:57:57Z","timestamp":1791349077000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Global length\u2013weight relationships of deep\u2010pelagic fishes: Coverage, biases and variability"],"prefix":"10.1111","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8544-2697","authenticated-orcid":false,"given":"J\u00falia R.","family":"Martins","sequence":"first","affiliation":[{"name":"Universidade Federal do Rio de Janeiro, Instituto de Biodiversidade e Sustentabilidade  Maca\u00e9 Rio de Janeiro Brazil"},{"name":"MARBEC, Universit\u00e9 de Montpellier, CNRS, Ifremer, IRD  S\u00e8te France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6748-9937","authenticated-orcid":false,"given":"Yan R.","family":"Kurtz","sequence":"additional","affiliation":[{"name":"Universidade Federal do Rio de Janeiro, Instituto de Biodiversidade e Sustentabilidade  Maca\u00e9 Rio de Janeiro Brazil"},{"name":"MARBEC, Universit\u00e9 de Montpellier, CNRS, Ifremer, IRD  S\u00e8te France"},{"name":"Universidade de S\u00e3o Paulo, Centro de Biologia Marinha  S\u00e3o Sebasti\u00e3o S\u00e3o Paulo Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0780-7854","authenticated-orcid":false,"given":"Michael M.","family":"Mincarone","sequence":"additional","affiliation":[{"name":"Universidade Federal do Rio de Janeiro, Instituto de Biodiversidade e Sustentabilidade  Maca\u00e9 Rio de Janeiro Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4723-179X","authenticated-orcid":false,"given":"Arnaud","family":"Bertrand","sequence":"additional","affiliation":[{"name":"MARBEC, Universit\u00e9 de Montpellier, CNRS, Ifremer, IRD  S\u00e8te France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2824-5224","authenticated-orcid":false,"given":"B\u00e1rbara T.","family":"Villarins","sequence":"additional","affiliation":[{"name":"Universidade Federal do Rio de Janeiro, Instituto de Biodiversidade e Sustentabilidade  Maca\u00e9 Rio de Janeiro Brazil"},{"name":"MARBEC, Universit\u00e9 de Montpellier, CNRS, Ifremer, IRD  S\u00e8te France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5492-7205","authenticated-orcid":false,"given":"Fl\u00e1via","family":"Lucena\u2010Fr\u00e9dou","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural de Pernambuco (UFRPE), Departamento de Pesca e Aquicultura  Recife Pernambuco Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0510-6424","authenticated-orcid":false,"given":"Thierry","family":"Fr\u00e9dou","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural de Pernambuco (UFRPE), Departamento de Pesca e Aquicultura  Recife Pernambuco Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5111-3169","authenticated-orcid":false,"given":"Maria F.","family":"Morais","sequence":"additional","affiliation":[{"name":"Universidade Federal Rural de Pernambuco (UFRPE), Departamento de Pesca e Aquicultura  Recife Pernambuco Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2369-4175","authenticated-orcid":false,"given":"Leandro N.","family":"Eduardo","sequence":"additional","affiliation":[{"name":"MARBEC, Universit\u00e9 de Montpellier, CNRS, Ifremer, IRD  S\u00e8te France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,6]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1439-0426.2006.00802.x"},{"key":"e_1_2_10_3_1","doi-asserted-by":"crossref","first-page":"309","DOI":"10.1590\/S1679-87592007000400007","article-title":"Maurolicus stehmanni Parin & Kobyliansky, 1993 (Sternoptychidae): Length of first maturation and spawning seasons in the south\u2010southeast Brazilian region","volume":"55","author":"Almeida E. 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