Reviews in Fish Biology and Fisheries

, Volume 27, Issue 4, pp 881–908 | Cite as

Mitigating bycatch in tuna fisheries

  • Martin Hall
  • Eric Gilman
  • Hiroshi Minami
  • Takahisa Mituhasi
  • Erin Carruthers
Research Paper

Abstract

Monitoring and managing fisheries bycatch is increasingly recognized as a critical component of robust fisheries management frameworks. This review, addressing this subject, begins by defining bycatch and analyzing the reasons it happens, from accidental to intentional discarding. It identifies the most common species composing bycatch of the main tuna fisheries using purse seine and longline gear. Considerations of options available to estimate bycatch, their potential biases and uncertainties, and ways to address these issues are discussed. The formulas used to estimate bycatch also point to the options to reduce them, lowering bycatch per unit of effort or lowering effort itself. It shows that a mean can be reduced by reducing all its component figures, or by eliminating the high values at the extreme of the distribution (i.e., where a small proportion of events causes a large proportion of the problem), a common issue in bycatch. A generic strategy is described that can be applied to all gears and fisheries, and it is then described for the fisheries of interest, showing examples of its application. These cover many mitigation actions based on gear and operational changes. Management options aiming at reducing bycatch are also mentioned. A detailed description of the ways the strategy has been implemented for purse seiners and longliners is provided. Finally, market strategies, education and awareness of stakeholders, mainly fishers, and some potential future developments are briefly described.

Keywords

Bycatch Longline Purse seine Tuna Fisheries 

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Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Martin Hall
    • 1
  • Eric Gilman
    • 2
  • Hiroshi Minami
    • 3
  • Takahisa Mituhasi
    • 4
  • Erin Carruthers
    • 5
  1. 1.Inter-American Tropical Tuna CommissionLa JollaUSA
  2. 2.Pelagic Ecosystems Research GroupHonoluluUSA
  3. 3.National Research Institute of Far Seas FisheriesFisheries Research AgencyShimizuJapan
  4. 4.Kagoshima UniversityKagoshimaJapan
  5. 5.Fisheries and Marine Institute of Memorial UniversitySt. John’sCanada

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