Raposeiro, Pedro M.Ramos, JoãoCosta, Ana C.2011-04-202011-04-202011"ARQUIPÉLAGO. Life and Marine Sciences". ISSN 0873-4704. Nº 28 (2011): 11-130873-4704http://hdl.handle.net/10400.3/1112[...]. This short communication, reporting the occurrence of C. sowerbii in the Congro Lake (São Miguel), is a result of the ongoing monitoring work of freshwater ecosystems performed by the University of Azores (e.g Gonçalves et al. 2008; Raposeiro & Costa 2009). Intense sampling has been carried out for the last six years in freshwater systems, but only now did we find this species.engCongro Lake (São Miguel)Freshwater EcosystemsCraspedacusta sowerbii (Lankester, 1880)journal article