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Context. Models of hierarchical structure formation predict the accretion ofsmaller satellite galaxies onto more massive systems and this process should beaccompanied by a disintegration of the smaller companions visible, e.g., intidal streams. Aims. In order to verify and quantify this scenario we havedeveloped a search strategy for low surface brightness tidal structures arounda sample of 474 galaxies using the Sloan Digital Sky Survey DR7 archive.Methods. Calibrated images taken from the SDSS archive were processed in anautomated manner and visually inspected for possible tidal streams. Results. Wewere able to extract structures at surface brightness levels ranging from \sim24 down to 28 mag arcsec-2. A significant number of tidal streams was found andmeasured. Their apparent length varies as they seem to be in different stagesof accretion. Conclusions. At least 6% of the galaxies show distinct streamlike features, a total of 19% show faint features. Several individual cases aredescribed and discussed.

Tidal streams around galaxies in the SDSS DR7 archive