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In order to estimate plankton biomass transport through the Gibraltar Strait, plankton biomass and velocity profiles were measured at three stations located in the eastern side of the Strait as a part of the CANIGO project. Abundance and biomass measurements were carried out for autotrophic (Prochlorococcus, Synechococcus and eukaryotic pico-nano-and microplankton) and heterotrophic (bacteria and nanoflagellates) organisms, in September 1997. Biomass and velocity decreased from the surface to deeper water. Highest biomass concentration was observed at the northern station (0.12 g C m− 3), whereas maximum mean velocities (80 cm s− 1) were found at the central and southern stations. Biomass transport is estimated with a approach with a 10-m resolution in the vertical and three subareas of approximately 5 km in the horizontal direction. Estimate of plankton biomass transports towards the …