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First observations of operational interactions between bottom-trawling fisheries and South American sea lion, Otaria flavescens in south-central Chile

Published online by Cambridge University Press:  21 September 2012

Pablo Reyes ,
Rodrigo Hucke-Gaete  and
Juan Pablo Torres-Florez
Pablo Reyes
Affiliation:
Endesa, Grupo Líneas Base, Especialidad Ingeniería Ambiental, Gerencia Ingeniería Latam, Santa Rosa 79, Piso 9, Santiago, Chile
Rodrigo Hucke-Gaete
Affiliation:
Instituto de Ciencias Marinas y Limnologicas, Universidad Austral de Chile, Casilla 567, Valdivia, Chile Centro Ballena Azul, Carlos Anwandter 624, Casa 4, Valdivia, Chile Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Portales 73, Coyhaique, Chile
Juan Pablo Torres-Florez*
Affiliation:
Centro Ballena Azul, Carlos Anwandter 624, Casa 4, Valdivia, Chile Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
*
Correspondence should be addressed to: J.P. Torres-Florez, Instituto de Ciencias Ambientales y Evolutivas, Universidad Austral de Chile, Casilla 567, Valdivia, Chile email: [email protected]
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Abstract

This paper presents results of a study conducted on the trawling industrial fishery fleet of Merluccius gayi in south-central Chile, and the resulting interactions with the South American sea lion (Otaria flavescens). This study is based on observations made during September 2004, when incidental sea lion catch in the trawls was 6.3 sea lions/working day (1.2 sea lions/trawl−1). A total of 82 animals were incidentally caught, of which 12 were found dead, and the 70 remaining suffered from internal bleeding and/or fractures as a result of their capture. 83.3% of the fatalities occurred during nocturnal trawls, which comprise 30% of all observed trawls. Possible mechanisms of sea lion take are discussed. This note presents the first records of sea lions incidental by-catch by the trawler fleet along the south-east Pacific coast of Chile.

Keywords

by-catchmarine mammalMerluccius gayifishing mortality
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Special Issue 2: Fish and Fisheries , March 2013 , pp. 489 - 494
Copyright
Copyright © Marine Biological Association of the United Kingdom 2012

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References

REFERENCES

Aguayo, A. and Maturana, R. (1973) Presencia del lobo marino común (Otaria flavescens) en el litoral chileno. Biología Pesquera Chile 6, 45–75.Google Scholar
Aguayo-Lobo, A., Díaz, H., Yánez, J., Palma, F. and Sepúlveda, M. (1998) Censo poblacional del lobo marino común en el litoral de la V a la IX Regiones. Informe Final, Proyecto FIP 96/51, 1–214.Google Scholar
Alverson, D., Freeburg, M., Murawski, S. and Pope, J. (1994) A global assessment of fisheries by-catch and discards. FAO Fisheries Technical Paper 339, 1–233.Google Scholar
Arata, J. and Hucke-Gaete, R. (2005) Muerte silenciosa en el mar: la pesca incidental de aves y mamíferos marinos en Chile. Oceana 10, 1–86.Google Scholar
Bartheld, J.L., Pavés, H., Vera, C., Manque, C. and Miranda, D. (2008) Cuantificación poblacional de lobos marinos en el litoral de la I a IV Región. Informe Técnico Fondo de Investigación Pesquera IT/2006-50.Google Scholar
Beverton, R. (1985) Analysis of marine mammal–fisheries interactions. In Beddington, J.R., Beverton, R.J.H. and Lavigne, D. (eds) Marine mammals and fisheries. London: George Allen & Unwin, pp. 3–33.Google Scholar
Campagna, C., Werner, R., Karesh, W., Marin, M., Koontz, F., Cook, R. and Koontz, C. (2001) Movements and location at sea of South American sea lions (Otaria flavescens). Journal of Zoology 257, 205–220.Google Scholar
Cox, T, Lewison, R., Zydelis, R., Crowder, L., Safina, C. and Read, A. (2007) Comparing effectiveness of experimental and implemented by-catch reduction measures: the ideal and the real. Conservation Biology 21, 1155–1164.CrossRefGoogle Scholar
FAO (2010) The state of world fisheries and aquaculture 2010. Rome: FAO Fisheries and Aquaculture Department, Food and Agriculture Organization of the United Nations, 218 pp.Google Scholar
Fertl, D. and Leatherwood, S. (1997) Cetacean interactions with trawls: a preliminary review. Journal of Northwest Atlantic Fishery Science 22, 219–248.Google Scholar
Goetz, S., Wolff, M., Stotz, W. and Villegas, M. (2008) Interactions between the South American sea lion (Otaria flavescens) and the artisanal fishery off Coquimbo, northern Chile. ICES Journal of Marine Science 65, 1739–1746.Google Scholar
Halpern, B., Walbridge, S., Selkoe, K., Kappel, C., Micheli, F., D'Agrosa, C., Bruno, J., Casey, K., Ebert, C., Fox, H., Fujita, R., Heinemann, D., Lenihan, H., Madin, E., Perry, M., Selig, E., Spalding, M., Steneck, R. and Watson, R. (2008) A global map of human impact on marine ecosystems. Science 319, 948–952.CrossRefGoogle ScholarPubMed
Hucke-Gaete, R., Moreno, C. and Arata, J. (2004) Operational interactions between cetaceans and the Patagonian toothfish (Dissostichus eleginoides) industrial fishery off southern Chile. CCAMLR Science 11, 127–140.Google Scholar
Hückstädt, L. and Antezana, T. (2003) Behaviour of the southern sea lion (Otaria flavescens) and consumption of the catch during purse-seining for jack mackerel (Trachurus symmetricus) off central Chile. ICES Journal of Marine Science 60, 1003–1011.Google Scholar
Hückstädt, L. and Krautz, M. (2004) Interaction between southern sea lions Otaria flavescens and jack mackerel Trachurus symmetricus commercial fishery off Central Chile: a geostatistical approach. Marine Ecology Progress Series 282, 285–294.Google Scholar
Lewison, R., Crowder, L., Read, A. and Freeman, S. (2004) Understanding impacts of fisheries by-catch on marine megafauna. Trends in Ecology and Evolution 19, 598–604.Google Scholar
Lillo, S., Rojas, R., Tascheri, R., Ojeda, V., Olivares, J., Balbontín, F., Bravo, R., Nuñez, S., Braun, M., Ortiz, J., Torres, P., Véjar, P., Cubillos, F. and Saavedra, A. (2003) Evaluación hidroacústica del recurso merluza común en la zona centro-sur, 2002. Informe Final, Proyecto FIP 02/03, 1–648.Google Scholar
Moreno, C., Hucke-Gaete, R. and Arata, J. (2003) Interacción de la pesquería del bacalao de profundidad con mamíferos y aves marinas. Informe Final, Proyecto FIP 01/31, 1–211.Google Scholar
Myers, R.A. and Worm, B. (2003) Rapid worldwide depletion of predatory fish communities. Nature 423, 280–283.Google Scholar
Niklitschek, E., Boyer, D., Merino, R., Hampton, I., Soule, M., Nelson, J., Cornejo, J., Lafon, A., Oyarzún, C., Roa, R. and Melo, T. (2005) Estimación de la biomasa reproductiva de orange roughy en sus principales zonas de concentración, 2004. Informe Final Proyecto FIP 04/13, 1–159.Google Scholar
Northridge, S. (1984) World review of interactions between marine mammals and fisheries. FAO Fisheries Technical Paper 251, 1–190.Google Scholar
Northridge, S. (1991) An updated world review of interactions between marine mammals and fisheries. FAO Fisheries Technical Paper 734, 1–58.Google Scholar
Oliva, D., Sielfeld, W., Durán, L., Sepúlveda, M., Pérez, M., Rodríguez, L., Stotz, W. and Araos, V. (2003) Interferencia de mamíferos con actividades pesqueras y de acuicultura. Informe Final, Proyecto FIP 03/32, 1–227.Google Scholar
Oliva, D., Sielfeld, W., Buscaglia, M., Matamala, M., Pavés, H., José Pérez, M., Schrader, D., Sepúlveda, M., Urra, A., Farias, F., Inostroza, P. and Melo, A. (2008) Plan de acción para disminuir y mitigar los efectos de las interacciones del lobo marino común (Otaria flavescens) con las actividades de pesca y acuicultura. Informe Técnico Fondo de Investigación Pesquera IP-IT/2006–34.Google Scholar
Pauly, D., Christensen, V., Dalsgaard, J., Froese, R. and Torres, F. Jr (1998) Fishing down the marine food webs. Science 279, 860–863.Google Scholar
Pemberton, D., Merdsoy, B., Gales, R. and Renouf, D. (1994) The interaction between offshore cod trawlers and Harp Phoca groenlandica and Hooded Cystophora cristata seals off Newfoundland, Canada. Biological Conservation 68, 123–127.Google Scholar
Perez, M.A. and Loughlin, T.R. (1991) Incidental catch of marine mammals by foreign and join venture trawl vessels in the U.S. EEZ of the North Pacific. NOAA Technical Report NMFS 104, 1–57.Google Scholar
Read, A. (2005) By-catch and depredation. In Reynolds, J., Perrin, W., Reeves, R., Montgomery, S and Ragen, T. (eds) Marine mammal research, conservation beyond crisis. Baltimore, MD: Johns Hopkins University Press, pp. 5–17.Google Scholar
Read, A. (2008) The looming crisis: interactions between marine mammals and fisheries. Journal of Mammalogy 89, 541–548.CrossRefGoogle Scholar
Read, A., Drinker, P. and Northridge, S. (2006) By-catch of marine mammals in US and global fisheries. Conservation Biology 20, 163–169.Google Scholar
Romero, M.A., Dans, S., González, R., Svendsen, G., García, N. and Crespo, E. (2011) Solapamiento trófico entre el lobo marino de un pelo Otaria flavescens y la pesquería de arrastre demersal del golfo San Matías, Patagonia, Argentina. Latin American Journal of Aquatic Research 39, 344–358.CrossRefGoogle Scholar
Sepúlveda, M., Pérez, M.J., Oliva, D., Durán, L.R., Sielfeld, W., Araos, V. and Buscaglia, M. (2007a) Operational interaction between South American sea lions Otaria flavescens and artisanal (small-scale) fishing in Chile: results from interview surveys and on-board observations. Fisheries Research 83, 332–340.Google Scholar
Sepúlveda, M., Oliva, D., Pérez, M.J., Moraga, R., Urra, A., Schrader, D., Pavés, H. and Buscaglia, M. (2007b) Censo poblacional de lobos marinos en el litoral de la V a IX Región. Informe Técnico Fondo de Investigación Pesquera.Google Scholar
Sepúlveda, M., Oliva, D., Urra, A., Pérez-Álvarez, M.J., Moraga, R., Schrader, D., Inostroza, P., Melo, A., Díaz, H. and Sielfeld, W. (2011) Distribution and abundance of the South American sea lion Otaria flavescens (Carnivora: Otariidae) along the central coast off Chile. Revista Chilena de Historia Natural 84, 97–106.Google Scholar
SERNAPESCA (2010) Anuario estadístico de pesca. Valparaíso, Chile: Servicio Nacional de Pesca, Valparaíso. Available at: http://www.sernapesca.cl (accessed 1 July 2012).Google Scholar
Shaughnnesy, A. and Payne, I. (1979) Incidental mortality of Cape fur seals during trawl fishing activities in South African waters. Fisheries Bulletin, South Africa 12, 20–25.Google Scholar
Shaughnessy, P. and Davenport, S. (1996) Underwater videographic observations and incidental mortality of fur seals around fishing equipment in south-eastern Australia. Marine and Freshwater Research 47, 553–556.CrossRefGoogle Scholar
Shima, M., Hollowed, A. and VanBlaricom, G. (2000) Response of pinniped populations to direct harvest, climate variability, and commercial fishery activity: a comparative analysis. Reviews in Fisheries Science 8, 89–124.Google Scholar
Sielfeld, W. (1999) Estado del conocimiento sobre conservación y preservación de Otaria flavescens (Shaw, 1800) y Arctocephalus australis (Zimmermann, 1783) en las costas de Chile. Estudios Oceanológicos 18, 81–96.Google Scholar
StatSoft, Inc (2004) STATISTICA (data analysis software system), version 7. Available at: www.statsoft.com (accessed 1 July 2012).Google Scholar
Torres, D. (1979) Mamíferos marinos de Chile: antecedentes y situación actual. Biología Pesquera, Chile 11, 49–81.Google Scholar
Venegas, C., Gibbons, J., Aguayo, A., Sielfeld, W., Acevedo, J., Amado, N., Capella, J., Guzmán, G. and Valenzuela, C. (2002) Distribución y abundancia de lobos marinos (Pinnipedia: Otariidae) en la Región de Magallanes. Anales del Instituto de la Patagonia (Chile) 30, 67–82.Google Scholar
Wallace, B.P., Lewison, R.L., McDonald, S.L., McDonald, R.K., Kot, C.Y., Kelez, S., Bjorkland, R.K., Finkbeiner, E.M., Helmbrecht, S. and Crowder, L.B. (2010) Global patterns of marine turtle by-catch. Conservation Letters 3, 131–142.Google Scholar
Waring, G., Gerrior, P., Payne, P., Parry, B. and Nicolas, J. (1990) Incidental take of marine mammals off the Northeast United States, 1977–88. Fishery Bulletin 88, 347–360.Google Scholar