The nematodes were collected from livers of Baltic cod caught off the Gulf of Gdańsk. This paper consists of a description of the third stage larvae of Contracaecum osculatum (Rud.). This nematode is also pathogenic for man and its occurrence on the Polish coast has epidemiological significance.
Institute of Marine and Tropical Medicine, Powstania Styczniowego 9b, 81-519 Gdynia, Poland
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