Effects of biological, economic and management factors on tuna and billfish stock status - Université de Montpellier
Article Dans Une Revue Fish and Fisheries Année : 2017

Effects of biological, economic and management factors on tuna and billfish stock status

Maite Pons
  • Fonction : Auteur
Trevor Branch
  • Fonction : Auteur
Michael Melnychuk
  • Fonction : Auteur
Olaf Jensen
  • Fonction : Auteur
Jon Brodziak
  • Fonction : Auteur
Shelton Harley
  • Fonction : Auteur
Alan Haynie
  • Fonction : Auteur
Laurie Kell
  • Fonction : Auteur
Mark Maunder
  • Fonction : Auteur
Ana Parma
  • Fonction : Auteur
Victor Restrepo
  • Fonction : Auteur
Rishi Sharma
  • Fonction : Auteur
Robert Ahrens
  • Fonction : Auteur
Ray Hilborn
  • Fonction : Auteur

Résumé

Commercial tunas and billfishes (swordfish, marlins and sailfish) provide considerable catches and income in both developed and developing countries. These stocks vary in status from lightly exploited to rebuilding to severely depleted. Previous studies suggested that this variability could result from differences in life-history characteristics and economic incentives, but differences in exploitation histories and management measures also have a strong effect on current stock status. Although the status (biomass and fishing mortality rate) of major tuna and billfish stocks is well documented, the effect of these diverse factors on current stock status and the effect of management measures in rebuilding stocks have not been analysed at the global level. Here, we show that, particularly for tunas, stocks were more depleted if they had high commercial value, were long-lived species, had small pre-fishing biomass and were subject to intense fishing pressure for a long time. In addition, implementing and enforcing total allowable catches (TACs) had the strongest positive influence on rebuilding overfished tuna and billfish stocks. Other control rules such as minimum size regulations or seasonal closures were also important in reducing fishing pressure, but stocks under TAC implementations showed the fastest increase of biomass. Lessons learned from this study can be applied in managing large industrial fisheries around the world. In particular, tuna regional fisheries management organizations should consider the relative effectiveness of management measures observed in this study for rebuilding depleted large pelagic stocks.

Dates et versions

hal-01926991 , version 1 (19-11-2018)

Identifiants

Citer

Maite Pons, Trevor Branch, Michael Melnychuk, Olaf Jensen, Jon Brodziak, et al.. Effects of biological, economic and management factors on tuna and billfish stock status. Fish and Fisheries, 2017, 18 (1), pp.1 - 21. ⟨10.1111/faf.12163⟩. ⟨hal-01926991⟩
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