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Results from a multidisciplinary environmental cruise carried out in the Common Fishing Zone (ZCP by its Spanish acronym) on board the BIP 'Cap. Oca Balda' (25th March - 1st April 2014) are presented. Sampling was conducted along two transects on the continental shelf from the coastal sector (COS) through the shelf-break (TAL) and beyond, at the latitudes of Mar del Plata (Argentina) and La Paloma (Uruguay). These transects were identified as COSTAL I and COSTAL II respectively, comprising six stations each. The same sequence of activities was performed at each station, starting by measurements of temperature, salinity, fluorescence and light penetration profiles, followed by water sampling with Niskin bottles. These water samples were used for the analyses of nutrients, dissolved oxygen, total alkalinity - dissolved inorganic carbon, absorption by particulate and chromophoric dissolved organic matter (CDOM), concentration of total chlorophyll a (ClaT ) and the concentration due to the phytoplankton fraction smaller than 5 mu m (Cla<5), pigment composition, bacterioplankton abundance, search and counting of entheropathogenic microorganisms, hydrocarbon degrading bacteria (BDH), and all phytoplankton fractions. Finally, tows with different plankton nets were also performed: Bongo (67 and 200 mu m), Bongo (300 mu m) and Nackthai (400 mu m).Original Abstract: En este trabajo se presentan resultados de una campana ambiental multidisciplinaria realizada en la Zona Comun de Pesca (ZCP) en el BIP 'Cap. Oca Balda' (25 de Marzo al 1 de Abril de 2014). Los muestreos se distribuyeron en dos secciones en la plataforma continental desde el sector costero (COS) hasta trasponer el talud continental (TAL), a las latitudes de Mar del Plata (Argentina) y La Paloma (Uruguay), denominandose COSTAL I y COSTAL II, respectivamente. En cada una se ubicaron seis estaciones, en las que se siguio una misma secuencia de actividades comenzando con la adquisicion de los perfiles de temperatura, salinidad, fluorescencia y penetracion de luz. Luego, se tomaron muestras de agua con botellas 'Niskin', las cuales se utilizaron para analizar nutrientes, oxigeno disuelto, alcalinidad total - carbono inorganico disuelto, absorcion del material particulado y del organico disuelto coloreado (CDOM), concentracion de clorofila a total (ClaT ) y la debida a la fraccion del fitoplancton menor a 5 mu m (Cla<5), diversidad de pigmentos, abundancia del bacterioplancton, busqueda y recuento de microorganismos enteropatogenos, bacterias degradadoras de hidrocarburos (BDH) y de todas las fracciones del fitoplancton. Finalmente, se realizaron muestreos con diferentes redes de plancton: mini-Bongo (67 y 200 mu m), Bongo (300 mu m) y Nackthai (400 mu m).