Otolith elemental fingerprints of juvenile Pacific swordfish Xiphias gladius

R. L. Humphreys*, S. E. Campana, E. E. DeMartini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The trace element composition of young-of-the-year (YOY) juvenile swordfish Xiphias gladius sagittal otoliths were analysed as a preliminary test of the value of otolith elemental fingerprints for determining swordfish nursery ground origins in the central Pacific Ocean. A suite of five elements (Mg, Zn, Sr, Ba and Pb) was assayed with isotope dilution ICP-MS; all elemental concentrations were roughly comparable to otoliths of other marine fishes. Multivariate analyses of elemental fingerprints based on Ba and Sr revealed differences between sample sites, and the magnitude of the differences increased with latitudinal separation. With more comprehensive sampling of nursery grounds, it should be possible to identify origin of nursery ground for adult swordfish by analysing the YOY juvenile portion of the sagittal Otolith.

Original languageEnglish
Pages (from-to)1660-1670
Number of pages11
JournalJournal of Fish Biology
Volume66
Issue number6
DOIs
Publication statusPublished - Jun 2005

Other keywords

  • Central Pacific
  • Isotope dilution ICP-MS
  • Juvenile otoliths
  • Otolith chemistry
  • Swordfish nursery areas
  • Xiphias gladius

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