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STUDY O F A MOUNTAIN STREAM IN A GRANITIC REGION IN THE NORTH O F PORTU-GAL Macrofauna, fishes and physico-chemical characteristics have been studied in the Olo nver (Douro Basin), placed in the Natural Park of .Alviio, north Portugal. During 1.5 year, every 3 months, samples of macrofauna and water for chemical analyses have been taken in 3 stations along the river. In order to assess fish species and biomass, electrofishing has been made in 2 stations. This stream can be charactenzed as adoi:10.23818/limn.02.23 fatcat:jnwmtqulezbovbpgnjdghxh4re