Adaptive responses of tropical tuna purse-seiners under temporal regulations
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The failure to achieve fisheries management objectives has been broadly discussed in international meetings. Measuring the effects of fishery regulations is difficult due to the lack of detailed information. The yellowfin tuna fishery in the eastern Pacific Ocean offers an opportunity to evaluate the fishers’ responses to temporal regulations. We used data from observers on-board Mexican purse-seine fleet, which is the main fleet fishing on dolphin-associated tuna schools. In 2002, the Inter-American Tropical Tuna Commission implemented a closed season to reduce fishing effort for this fishery. For the period 1992–2008, we analysed three fishery indicators using generalized estimating equations to evaluate the fishers’ response to the closure. We found that purse-seiners decreased their time spent in port, increased their fishing sets, and maintained their proportion of successful fishing sets. Our results highlight the relevance of accounting for the fisher behaviour to understand fisheries dynamics when establishing management regulations.
KeywordsClosed season Eastern tropical Pacific Fisher behaviour Purse-seine fishing Tropical tuna
We thank anonymous referees for suggestions that helped to improve the paper. The fisheries data analysed in this publication were collected by the Programa Nacional de Aprovechamiento del Atún y de Protección de Delfines (PNAAPD). Data collection is supported by the research fund FIDEMAR, which is formed by the National Chamber of the Fishing Industry (CANAINPESCA), the Federal Government (CONAPESCA-INAPESCA), and the Mexican foundation for the preservation of marine wildlife (FUMDAMAR). This study was part of the Ph.D. thesis conducted by the first author (ETI) at the University of Montpellier 2 (ED SIBAGHE) and funded by Consejo Nacional de Ciencia y Tecnología (CONACYT), Mexico, scholarship No. 199730.
- Dreyfus-León, M.J., and J.G. Vaca-Rodríguez. 2003. An age-structured stochastic model of the yellowfin tuna (Thunnus albacares) Eastern Pacific fishery. Oceánides (La Paz, B.C.S.) 18: 23–31.Google Scholar
- FAO. 2008. Fisheries management. 3. Managing fishing capacity. Vol. 3. FAO Technical Guidelines for Responsible Fisheries 4. Rome.Google Scholar
- Højsgaard, S., U. Halekoh, and J. Yan. 2006. The R Package geepack for generalized estimating equations. Journal of Statistical Software 15: 1–11.Google Scholar
- IATTC. 2004. Fishery Status report. Tunas and billfishes in the Eastern Pacific Ocean in 2003. 2. IATTC.Google Scholar
- IATTC. 2015. Fishery status report. Tunas, billfishes and other pelagic species in the Eastern Pacific Ocean in 2014. 13. IATTC.Google Scholar
- Knudsen, P.F. 1977. Spawning of yellowfin tuna and the discrimination of subpopulations. Inter-American Tropical Tuna Commission Bulletin 17: 117–169.Google Scholar
- Lopez, J., G. Moreno, I. Sancristobal, and J. Murua. 2014. Evolution and current state of the technology of echo-sounder buoys used by Spanish tropical tuna purse seiners in the Atlantic, Indian and Pacific Oceans. Fisheries Research 155: 127–137. doi: 10.1016/j.fishres.2014.02.033.CrossRefGoogle Scholar
- Maunder, M.N., and S.J. Harley. 2006. Evaluating tuna management in the eastern Pacific Ocean. Bulletin of Marine Science 78: 593–606.Google Scholar
- McIlgorm, A. 2010. Economic impacts of climate change on sustainable tuna and billfish management: Insights from the Western Pacific. Progress in Oceanography 86. CLimate Impacts on Oceanic TOp Predators (CLIOTOP) CLIOTOP CLIOTOP International Symposium, 187–191. doi: 10.1016/j.pocean.2010.04.024.
- R Core Team. 2014. R: A language and environment for statistical computing, Viena, Austria.Google Scholar
- Russo, T., J. Pulcinella, A. Parisi, M. Martinelli, A. Belardinelli, A. Santojanni, S. Cataudella, S. Colella, et al. 2015. Modelling the strategy of mid-water trawlers targeting small pelagic fish in the Adriatic Sea and its drivers. Ecological Modelling 300: 102–113. doi: 10.1016/j.ecolmodel.2014.12.001.CrossRefGoogle Scholar
- Schaefer, K.M. 1998. Reproductive biology of yellowfin tuna (Thunnus albacares) in the eastern Pacific Ocean. Inter-American Tropical Tuna Commission Bulletin 21: 205–272.Google Scholar
- Solana-Sansores, R., I. Dicante, and L.P. Arredondo-Uribe. 2009. Dinámica de la flota atunera mexicana del Océano Pacífico Oriental. Hidrobiológica 19: 225–232.Google Scholar
- Torres-Irineo, E., D. Gaertner, E. Chassot, and M. Dreyfus-León. 2014. Changes in fishing power and fishing strategies driven by new technologies: The case of tropical tuna purse seiners in the eastern Atlantic Ocean. Fisheries Research 155: 10–19. doi: 10.1016/j.fishres.2014.02.017.CrossRefGoogle Scholar