EN
Post-mortem examinations were performed in 35 sea-gulls from Vistula bay region, to collect Trematoda from fish-eating birds and compare them with those found in foxes fed on fish from Vistula bay (table). Two species of Trematoda were found: Cryptocotyle concavum (Creplin, 1825) and Apophallus mühlingi (Jägerskiöld, 1899), which also occur in foxes. Three species: Renicola lari Timon-David, 1933, Maritrema subdolum Jägerskiöld, 1909 and Diplostomum baeri Dubois, 1937 are new for the Polish fauna.