Keywords
Marine Protected Area
illegal fishery
Thunnus albacares
yellowfin tuna
Cocos Island.
Pesca ilegal
Parque Nacional Isla del Coco
atún aleta amarilla
Thunnus albacares.
How to Cite
Abstract
Isla del Coco National Park (ICNP), Costa Rica, is renowned for its large aggregations of pelagic species, especially sharks (Carcharhinidae and Sphyrnidae), billfish (Istiophoridae) and tuna (Scombridae). The high abundance of these sought after species, attracts commercial fishing vessels that enter the protected waters of the Park. Illegal fisheries thus represent one of the biggest threats to the ecological integrity of this World Heritage Site. The ICNP dedicates important resources to protection and control via regular surveillance patrols, along the 12 nautical miles that have Marine Protected Area (MPA) status. During 2012, 2013 and between January and August 2014, 405 surveillance patrols within the MPA found 108 fishing lines, more than 13 000 hooks, seized more than 500 km of fishing line and 257 pelagic individuals. The yellowfin tuna (Thunnus albacares) was the most abundant species, representing more than 72.3 % of the total catch; seized individuals had a mean total length of 153.35±23.19 cm (Min=90 cm; Max=190 cm); which indicates that most individuals were adults. Analysis of monthly CPUE showed that the highest relative abundance of illegally caught T. albacores was between May and August of each year, with a mean relative abundance of 26.13±54.71, 11.63±23.79, 13.71±24.52 tunas per 1 000 hooks in 2012, 2013, 2014, respectively. This species had a high survival rate (nearly 80 % of the individuals found on the lines were still alive), probably due to the short fishing lines used by illegal fishermen, combined with the swift intervention of rangers. The CPUE of T. albacares found in this study is greater than records in Costa Rica’s Exclusive Economic Zone (0.74 and 0.44 per 1 000 hooks respectively). These results highlight the importance of ICNP as an aggregation site for T. albacares and the need for its effective protection. It is important that ranger intervention continue to be as rapid and effective as possible, in order to decrease the impact of illegal fishing on the marine biodiversity of the ICNP.
References
Área de Conservación Marina Isla del Coco (ACMIC). (2006). Informes periódicos sobre la aplicación de la convención del Patrimonio Mundial. San José, Costa Rica: SINAC, MINAE.
Albaret, J. J. (1977). La reproduction de l’albacore (Thunnus albacares) dans le Golfe de Guinée. Cash. ORSTOM. Séries Océanographie, 15(4), 389-419.
Arias, A., Pressey, R. L., Jones, R. E., Álvarez-Romero, J., & Cinner, J. E. (2014). Optimizing enforcement and compliance in offshore marine protected areas: A case study from Cocos Island, Costa Rica. Oryx, 1. doi:10.1017/S0030605314000337.
Bessudo, S., Soler, G., Klimley, P., Ketchum, J., Hearn, A., & Arauz, R. (2011). Residency of the scalloped hammerhead shark (Sphyrna lewini) at Malpelo Island and evidence of migration to other islands in the Eastern Tropical Pacific. Environmental Biology of Fishes, 91, 165-176.
Cajiao, V. (Ed.). (2005). Ley de Pesca y Acuicultura. San José, Costa Rica: Litografía IPECA.
Campos, J. A., Segura, A., Lozano, O., & Madrigal, E. 1993. Ecología básica de Coryphaena hippurus (Pisces, Coryphaenidae) y abundancia de grandes pelágicos en el Pacífico de Costa Rica. Revista Biología Tropical, 41(3), 783-790.
Castro, C., Gonzáles, W., & Estrada, F. (2008). Informe Anual: CONVENIO GUARDACOSTAS-MINAE-MARVIVA Comisión tripartita. San José, Costa Rica: Ministerio de Ambiente Energía y Telecomunicaciones (MINAET).
Cortés, J. (2008). Historia de la investigación marina de la Isla del Coco, Costa Rica. Revista de Biología Tropical, 56(Suplemento 2), 1-18.
Cortés, J. (2012). Marine biodiversity of an Eastern Tropical Pacific oceanic island, Isla del Coco, Costa Rica. Revista de Biología Tropical, 60(Suplemento 3), 131-185.
Davis, M. W. (2002). Key principles for understanding fish bycatch discard mortality. Canadian Journal of Fisheries and Aquatic Sciences, 59, 1834-1843.
Di Rienzo, J. A., Casanoves, F., Balzarini, M., Gonzalez, L., Tablada, M., & Robledo, C. (2008). InfoStat, versión 2008. Grupo InfoStat, FCA, Universidad Nacional de Córdoba, Argentina.
Gale, M. K., Hinch, S., & Donaldson, M. R. (2013). The role of temperature in the capture and release of fish. Fish and Fisheries, 14, 1-33.
Gallagher, A. J., Orbesenc, E. S., Hammerschlaga, N., & Serafy, J. E. (2014). Vulnerability of oceanic sharks as pelagic longline bycatch. Global Ecology and Conservation, 1, 50-59.
Halpern, B. (2003). The impact of Marine Reserves: Do reserves work and does reserve size matter? Ecological Applications, 13(1), S117–S137.
Kelleher, G., Bleakley, C., & Wells, S. (1995). A Global representative system of Marine Protected Areas. Volume I. Washington, DC: The Great Barrier Reef Marine Authority, The World Bank and The World Conservation Union (IUCN).
Klimley, P., Jorgensen, S., Melo, A., & Beavers, S. (2003). The occurrence of yellowfin tuna (Thunnus albacares) at Espiritu Santo Seamount in the Gulf of California. Fish Bulletin, 101, 684-692.
Knapp, J. M., Heinisch1, G., Rosenfeld, H., & Lutcavage, M. E. (2013). New results on maturity status of Western Atlantic bluefin tuna, Thunnus thynnus. Collective Volume of Scientific Papers ICCAT, 69(2), 1005-1015.
Koido, T., & Suzuki, Z. (1989). Main spawning season of yellowfin tuna, Thunnus albacares, in the western tropical Pacific Ocean based on the gonad index. Bulletin of the National Research Institute of Far Seas Fisheries, 26, 153-164.
Lasso, J., & Zapata, L. (1999). Fisheries and biology of Coryphaena hippurus in the Pacific coast of Colombia and Panama. Scientia Marina, 63(3-4), 387-399.
Lizano, O. (2008). Dinámica de aguas alrededor de la Isla del Coco, Costa Rica. Revista Biología Tropical, 56(Suplemento 2), 31-48.
Lizano, O. 2012. Rasgos morfológicos alrededor de la Isla del Coco y de sus montes submarinos vecinos, Pacífico de Costa Rica. Revista Biología Tropical, 60(Suplemento 3), 43-51.
Morato, T., Hoyle, S. D., Allain, V., & Nicol, S. L. (2010). Seamounts are hotspots of pelagic biodiversity in the open ocean. Proceedings of the National of Sciences of the United States of America, 107, 9707-9711.
Patterson, K. R., & Martínez, J. (1991). Exploitation of dolphin-fish Coryphaena hipurrus off Ecuador: Analysis by length-based virtual population analysis. Fish byte, 9(2), 21-23.
Pauly, D., Christensen, V., Guénette, S., Pitcher, T. J., Sumaila, R. U., Walters, C. J., Watson, R., & Zeller, D. (2002). Towards sustainability in world fisheries. Nature, 418, 8.
Roberts, C. M., Hawkins, J. P., & Gell, F. R. (2005). The role of marine reserves in achieving sustainable fisheries. Philosophical Transactions of the Royal Society B: Biological Sciences, 360, 123-132.
Serna, J. (2006). Caracterización de las embarcaciones registradas en el Parque Nacional Isla del Coco. (Informe Técnico Proyecto-Protección de la Biodiversidad del Área de Conservación Marina Isla del Coco (ACMIC)). San José, Costa Rica: Fondo Francés para el Medio Ambiente Mundial (FFMEM) y SINAC.
Swimmer, Y., Wang, J., Arauz, R., & McCracken, M. (2010). Effects of hook offsets on target species catch rates and sea turtle bycatch in a shallow Costa Rican longline fishery. Aquatic Conservation of Marine and Freshwater Ecosystems, 10, 245-254.
Swimmer, Y., Suter, J., Arauz, R., Bigelow, K., López, A., Zanella, I., Bolaños, A., Ballestero, J., Suarez, R., Wang, J., & Boggs, C. (2011). Sustainable fishing gear: the case of modified circle hooks in a Costa Rican longline fishery. Marine Biology, 158, 757-767.
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