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Metacercariae of Diplostomum spp. have been detected in the eyes (lens, humour and under retina) of many species offish. Adult forms occure in the intestine of piscivorous birds, mostly Laridae. Eight young black-headed gulls, Larus ridibundus (L.) were infected with eye-flukes from the eyes of three-spined stickleback, Gasterosteus aculeatus (L.): five with flukes from the eye-lenses and three from the vitreous humour of eyes. After few days birds were euthanised with an ether overdose and the intestines were studied. In the intestine of experimentally infected birds were found adult stages of Diplostomum sp.
Key words: Diplostomum sp., Gulf of Gdańsk, stickleback, seagull