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Five out of 28 Great Cormorants collected in spring 2005 from the Vistula Lagoon were found to contain a total of 19 (16 in the stomach and 3 in the intestine) stage III larvae of Anisakis simplex. Spring is the season when nematode-infected herring from the western Baltic, Danish straits, and the North Sea arrive in the Vistula Lagoon and transmit the infection to cormorants feeding on them. This...
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