Study

Elasmobranch captures in the Fijian pelagic longline fishery

  • Published source details Piovano S. & Gilman E. (2017) Elasmobranch captures in the Fijian pelagic longline fishery. Aquatic Conservation: Marine and Freshwater Ecosystems, 27, 381-393.

Actions

This study is summarised as evidence for the following.

Action Category

Use a different hook type

Action Link
Marine Fish Conservation
  1. Use a different hook type

    A replicated, controlled study in 2011–2014 in an area of pelagic water in the South Pacific Ocean around Fiji (Piovano & Gilman 2017) found that using circle hooks in a longline fishery targeting mainly tunas (Scombridae) and swordfish (Xiphiidae) resulted in fewer incidental captures of sharks (Selachii) and rays (Batoidea), compared to conventional J-shaped hooks alone or a combination of J and circle hooks. Using circle hooks alone caught fewer sharks and rays than using J-shaped hooks or a combination of J and circle hooks, and fishing in July–December resulted in fewer shark and ray captures, compared to fishing in January–March (data reported as statistical model results and odds ratios). In addition, using larger size bait and shorter (<17 m) distances between secondary lines attached to the mainline reduced the incidental capture of rays (data reported as statistical model results and odds ratios). Data from 2,367 gear deployments were obtained from the Fiji Observer Programme for the Fiji longline fishery covering the period January 2011 to December 2014. Data were analysed to assess the effect of different factors on incidental capture of sharks and rays. These included hook type (J-shaped and circle hooks), bait sizes (large and small), distances between the branching lines on the mainline, years and season.

    (Summarised by: Leo Clarke)

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