Technical mitigation measures for sharks and rays in fisheries for tuna and tuna-like species: turning possibility into reality

Type Article
Date 2016-10
Language English
Author(s) Poisson Francois1, Abascal Crespo Francisco2, 8, Ellis Jim R.3, Chavance Pierre4, Pascal Bach4, Santos Miguel. N.5, Seret Bernard6, Korta Maria7, Coelho Rui8, Ariz Javier2, Murua Hilario7
Affiliation(s) 1 : Ifremer, UMR Marbec, Inst Francais Rech Exploitat Mer, CS 30171,Ave Jean Monnet, F-34203 Montpellier, France.
2 : Inst Espnaol Oceanog, POB 1373, Santa Cruz De Tenerife 38180, Spain.
3 : CEFAS, Lowestoft Lab, Pakefield Rd, Lowestoft NR33 OHT, Suffolk, England.
4 : IRD, UMR Marbec, CS 30171,Ave Jean Monnet, F-34203 Sete, France.
5 : ICCAT Secretariat, Calle Corazon Maria 8,6 Pl, Madrid 28002, Spain.
6 : IRD, Museum Natl Hist Nat, Dept Systemat Evolut, CP 51 55,Rue Buffon, F-75231 Paris 05, France.
7 : AZTI, Portualde Z-G, Pasaia 20110, Gipuzkoa, Spain.
8 : IPMA, Ave 5 Outubro S-N, P-8700305 Olhao, Portugal.
Source Aquatic Living Resources (0990-7440) (Edp Sciences S A), 2016-10 , Vol. 29 , N. 4 , P. 402 (1-3)
DOI 10.1051/alr/2016030
WOS© Times Cited 17
Keyword(s) Mitigation, elasmobranch, bycatch, pelagic, mortality, tuna regional fishery management organizations
Abstract Tuna fisheries have been identified as one of the major threats to populations of other marine vertebrates, including sea turtles, sharks, seabirds and marine mammals. The development of technical mitigation measures (MM) in fisheries is part of the code of conduct for responsible fisheries. An in-depth analysis of the available literature regarding bycatch mitigation in tuna fisheries with special reference to elasmobranchs was undertaken. Studies highlighting promising MMs were reviewed for four tuna fisheries (longline, purse seine, driftnets and gillnet, and rod and line – including recreational fisheries). The advantages and disadvantages of different MMs are discussed and assessed based on current scientific knowledge. Current management measures for sharks and rays in tuna Regional Fishery Management Organizations (t-RFMOs) are presented. A review of relevant studies examining at-vessel and postrelease mortality of elasmobranch bycatch is provided. This review aims to help fisheries managers identify pragmatic solutions to reduce mortality on pelagic elasmobranchs (and other higher vertebrates) whilst minimizing impacts on catches of target tuna species. Recent research efforts have identified several effective MMs that, if endorsed by t-RFMOs, could reduce elasmobranchs mortality rate in international tropical purse seine tuna fisheries. In the case of longline fisheries, the number of operational effective MMs is very limited. Fisheries deploying driftnets in pelagic ecosystems are suspected to have a high elasmobranchs bycatch and their discard survival is uncertain, but no effective MMs have been field validated for these fisheries. The precautionary bans of such gear by the EU and by some t-RFMOs seem therefore appropriate. Recreational tuna fisheries should be accompanied by science-based support to reduce potential negative impacts on shark populations. Priorities for research and management are identified and discussed.
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Poisson Francois, Abascal Crespo Francisco, Ellis Jim R., Chavance Pierre, Pascal Bach, Santos Miguel. N., Seret Bernard, Korta Maria, Coelho Rui, Ariz Javier, Murua Hilario (2016). Technical mitigation measures for sharks and rays in fisheries for tuna and tuna-like species: turning possibility into reality. Aquatic Living Resources, 29(4), 402 (1-3). Publisher's official version : , Open Access version :