Blar i forfatter "Jordaan, Gareth L."

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    • Effects of inconsistent reporting, regulation changes and market demand on abundance indices of sharks caught by pelagic longliners off southern Africa 

      Jordaan, Gareth L.; Santos, Jorge; Groeneveld, Johan C. (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-10-24)
      The assumption of a proportional relationship between catch-per-unit-effort (CPUE) and the abundance of sharks caught by pelagic longliners is tenuous when based on fisher logbooks that report only retained specimens. Nevertheless, commercial logbooks and landings statistics are often the only data available for stock status assessments. Logbook data collected from local and foreign pelagic longline ...

    • Shark discards in selective and mixed-species pelagic longline fisheries 

      Jordaan, Gareth L.; Santos, Jorge; Groeneveld, Johan C. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-31)
      The conservation status of several pelagic shark species is considered vulnerable with declining populations, yet data on shark fishing mortality remain limited for large ocean regions. Pelagic sharks are increasingly retained by mixed-species fisheries, or are discarded and not reported by selective fisheries for tunas (<i>Thunnus</i> spp.) or swordfish (<i>Xiphias gladius</i>). We estimated the ...