The expansion of the offshore wind power industry since the law of renewable energy (EEG) 2014 induces a change of the local ecosystem. The introduction of anthropogenic hard substrate by offshore wind turbines into a soft-bottom environment, such as the southern North Sea, results the diversification of the environment. Until now only less is known about the long-term effects on offshore wind farms on the ecosystem. As macrozoobenthos is a reliable indicator of environmental changes, investigations of epifouling benthos communities colonizing the turbines of the offshore test site alpha ventus were carried out from 2009 to 2012. The samples were taken biannually during spring and autumn at 1, 5 and 10 m depth. The 12 structures in alpha ventus include the structure types jackets and tripods, both made of steel. In comparison to 1 and 5 m, the first settlement of most species occured in 10 m. In the further course the number of species varied during spring with less species and autumn with decreased species number while no further influence of depth was shown. The epifouling of the structures showed a distinct zonation of depths and a succession over time. The pioneer species Jassa spp. and especially Jassa herdmani was the first settling species. Also J. herdmani reached the highest abundance of all species at all depth. After the first year of sampling Mytilus edulis dominated the whole sampling period by ’Mytilisation’ at 1 m water depth at an average of 9 kg m