Murky waters: Searching for structure in genetically depauperate blue threadfin populations of Western Australia

John B. Horne*, Paolo Momigliano, Lynne Van Herwerden, Stephen J. Newman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The blue threadfin (Eleutheronema tetradactylum) is an exploited fishery species in southeast Asia and Australia. Demographic studies have revealed fine-scale stock structure throughout the Australian coastline, with demographically isolated populations separated by only tens of km. Similarly, population genetic analysis revealed fine-scale structure across most of its Australian range with important implications for fisheries management. However, in northern Western Australia, genetic stock structure analysis showed a contradictory lack of structure. In the present study, one mtDNA marker and a suite of five microsatellite loci were used to further investigate the stock structure of Western Australian blue threadfin populations. By increasing sample sizes from previously investigated areas: Roebuck Bay (n=93 adults) and Eighty-mile Beach (n=92 adults and 163 recruits from two settlement cohorts), we were able to detect subtle genetic differentiation that was previously obscured by low levels of genetic polymorphism. Therefore, the same fine-scale stock structure that has been observed elsewhere in this species also appears to exist in Western Australia. This has clear ramifications for a revised management strategy that incorporates the fine scale structuring of northwest Western Australian stocks of the blue threadfin.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalFisheries Research
Volume146
DOIs
Publication statusPublished - Sep 2013

Keywords

  • Polynemidae
  • Population genetics
  • Recruitment cohorts
  • Self-recruitment

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