[OANNES Foro] Jellyfish bycatch diminishes profit in an anchovy fishery off Peru

[Mario Cabrejos]

Fisheries Research
Available online 18 May 2012

Jellyfish bycatch diminishes profit in an anchovy fishery off Peru
http://www.sciencedirect.com/science/article/pii/S0165783612001439
Javier Quiñonesa, , , Aldrin Monroyb, E. Marcelo Achac, Hermes Mianzanc, 
a Laboratorio Costero de Pisco, Instituto del Mar del Perú (IMARPE), Av. Los Libertadores A-12, Urb. El Golf, Paracas, Ica, Perúb Laboratorio Costero de Matarani, Instituto del Mar del Perú. (IMARPE), Av. Arequipa 405, Matarani, Islay, Arequipa, Perúc Instituto de Investigaciones Marinas y Costeras (Universidad Nacional de Mar del Plata y Consejo Nacional de Investigaciones Científicas y Técnicas) e Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo n°1, B7602HSA, Mar del Plata, Argentina

Abstract
Peru supports one of the world's largest single-species fisheries based on the Peruvian anchovy (Engraulis ringens L. Jenyns, 1842), and bycatch of the scyphomedusa Chrysaora plocamia (Lesson, 1832) affects this fishery. Medusae display strong seasonal fluctuations, with peak abundances during summer. Off southern Peru and during the austral summer 2008-2009, C. plocamia were > 30% of the catch in 5% of the hauls, which was enough to cause economic losses of more than 200,000 US$ in only 35 d of fishing. Fishery factories refused to receive the catch if jellyfish bycatch was > 40% of the catch in weight. Economic losses could substantially increase during warm periods like El Niño, during which C. plocamia medusa abundances greatly increase. This study was the first attempt to quantify economic losses due to jellyfish through the use of bycatch rates and interviews with employees of fishery factories.



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