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artículo (arbitrado) -- Universidad de Costa Rica. Centro de Investigaciones en Ciencias del Mar y Limnología (CIMAR), 2013Growing concern about the quantity and diversity of by-catch species caught in the bottom trawling nets of crustacean fisheries led us to compare the quantity of by-catch recorded in Chilean and Costa Rican deep-water shrimp fisheries by year, latitude, and bathymetry. We analyzed catches from 2143 trawl hauls between 2004 and 2009 from the fisheries of the northern nylon shrimp,Heterocarpus vicarius, and the kolibri shrimp,Solenocera agassizii, off Costa Rica and the Chilean nylon shrimp, Heterocarpus reedi, off Chile. A catch index was estimated to determine the quantity of by-catch retained for each kilogram of shrimp. The by-catch associated with the shrimp fisheries of Costa Rica and Chile was mainly fishes and crustaceans; by-catch species diversity was considerably higher in Costa Rica compared to that of Chile. In Chile, catches of H. reediand by-catch were greater in the central and southern zone, whereas in Costa Rica, catches of shrimp (H. vicarius, S. agassizii) and by-catch were higher in the central zone. In terms of bathymetry, the largest catches of shrimp and by-catch came from the deep stratum (between 251 and 400 m) for both countries; the by-catch was noticeably larger in this stratum in Costa Rica. The catch index revealed that for every 1 kg of shrimp caught in Costa Rica, 5.7 kg of by-catch were caught; in Chile, this ratio  was 1.1:1. However, the projected global by-catch was considerably higher for the fishery forH. reedithan for that ofH. vicarius,which is related to the landed volumes of the target species in Costa Rica and Chile. The encouraging results in the H. reedi-fishery concerning technical measures to reduce by-catch and discards rates should be also considered for Central American deep-water shrimp fisheries.The authors (PA and JCO) thank the Fondo de Investigación Pesquera (FIP)for funding the fishery assessment projects carried out off the central coastof Chile and for the availability of the data bases used to develop thepresent project. The researchers from Costa Rica (ISW, VNM and FVR)are thankful to the company The Rainbow Jewels, S.A., Puntarenas, fortheir ongoing support for monitoring the deepwater resources of PacificCosta Rica. Likewise, thanks a lot to the captains (Rigo and Esteban:“Mecate”), crews of the shrimp trawlers ONUVA and SULTANA, and allthe students who helped us with the collection and handling of the samples.Financial support was made available from the German company RisticAG, Oberferrieden, the Costa Rican company The Rainbow Jewels S.A.,Puntarenas, and the University of Costa Rica (projects V.I. No. 111-A4-508, V.I. No. 808-A9-536 and V.I. No. 808-A9-537). Additional fundingwas provided by the “Program University – Enterprise for SustainableDevelopment” (PUEDES) of the Council of Central American Universities(CSUCA), the German Society for Technical Cooperation (GTZ) andthe University of Kassel, Germany. Furthermore, we are grateful for thelogistic support provided by the Center of Marine Research and Limnology(CIMAR) and the School of Biology, University of Costa Rica. We aregrateful to Ing. Álvaro De Caso for his collaboration with the statisticalanalysis of the fishery data. Danielle Barriga and Tayler Clarke revised andimproved the English, which is greatly appreciated. Finally, we are thankfulto Raquel Romero-Emilia, who helped us to prepare the final version of thefigures.UCR::Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Ciencias del Mar y Limnología (CIMAR

journal of crustacean biology

By-catch associated with fisheries of Heterocarpus vicarius (Costa Rica) and Heterocarpus reedi (Chile) (Decapoda: Pandalidae): a six-year study (2004-2009)