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

Type Article
Date 2017-01
Language English
Author(s) Pons Maite1, Branch Trevor A.1, Melnychuk Michael C.1, Jensen Olaf P.2, Brodziak Jon3, Fromentin Jean-Marc4, Harley Shelton J.5, Haynie Alan C.6, Kell Laurie T.7, Maunder Mark N.8, Parma Ana M.9, Restrepo Victor R.10, Sharma Rishi11, 13, Ahrens Robert12, Hilborn Ray1
Affiliation(s) 1 : Univ Washington, Sch Aquat & Fishery Sci, Box 355020, Seattle, WA 98195 USA.
2 : Rutgers State Univ, Dept Marine & Coastal Sci, 71 Dudley Rd, New Brunswick, NJ 08901 USA.
3 : NOAA Fisheries, Natl Marine Fisheries Serv, Pacific Isl Fisheries Sci Ctr, 1845 Wasp Blvd, Honolulu, HI 96818 USA.
4 : IFREMER, UMR MARBEC Marine Biodivers Exploitat & Conservat, Blvd Jean Monnet,CS 30171, F-34203 Sete, France.
5 : Secretariat Pacific Community, Fisheries Aquaculture & Marine Ecosyst Div, BP D5, Noumea 98848, New Caledonia.
6 : NOAA Fisheries, Alaska Fisheries Sci Ctr, Bldg 4,7600 Sand Point Way NE, Seattle, WA 98115 USA.
7 : ICCAT Int Commiss Conservat Atlantic Tunas Secret, Corazon de Maria 8, Madrid 28002, Spain.
8 : IATTC, 8901 La Jolla Shores Dr, San Diego, CA 92037 USA.
9 : Consejo Nacl Invest Cient & Tecn, Ctr Nacl Patagon, Blvd Brown 2915,U9120ACD, Puerto Madryn, Chubut, Argentina.
10 : ISSF, 805 15th St NW,Suite 708, Washington, DC 20005 USA.
11 : IOTC, Le Chantier Mall,2nd Floor,POB 1011, Victoria, Mahe, Seychelles.
12 : Univ Florida, Program Fisheries & Aquat Sci, Sch Forest Resources & Conservat, POB 110410, Gainesville, FL 32653 USA.
13 : NOAA Fisheries, Southeast Fisheries Sci Ctr, 75 Virginia Beach Dr, Miami, FL 33149 USA.
Source Fish And Fisheries (1467-2960) (Wiley), 2017-01 , Vol. 18 , N. 1 , P. 1-21
DOI 10.1111/faf.12163
WOS© Times Cited 23
Keyword(s) Fisheries management, marine conservation, stock assessment, stock status, tuna fisheries
Abstract 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.
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Pons Maite, Branch Trevor A., Melnychuk Michael C., Jensen Olaf P., Brodziak Jon, Fromentin Jean-Marc, Harley Shelton J., Haynie Alan C., Kell Laurie T., Maunder Mark N., Parma Ana M., Restrepo Victor R., Sharma Rishi, Ahrens Robert, Hilborn Ray (2017). Effects of biological, economic and management factors on tuna and billfish stock status. Fish And Fisheries, 18(1), 1-21. Publisher's official version : https://doi.org/10.1111/faf.12163 , Open Access version : https://archimer.ifremer.fr/doc/00333/44383/