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Biogeography of the freshwater fish of the Iberian Peninsula

This paper reviews and presents new data on the composition and distribution of fish species in the continental waters of the Iberian Peninsula, and proposes a division of the Peninsula into three subregions: the Ebro-Cantabrian, the Atlantic and the Betico-Mediterranean, based on the distribution of the 45 species (native and endemic) in the 22 river basins with surface aseas of 990 square kilometres os more.