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.


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)

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 21

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape ProgrammeRed List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Mauritian Wildlife Supporting Conservation Leaders
Sustainability Dashboard National Biodiversity Network Frog Life The international journey of Conservation - Oryx Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered species Vincet Wildlife Trust