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The mass incidence of the parasite was detected in Abramis brama (L) from the dam reservoir of the Gródek-Żur electricity works on the Wda river (Bydgoszcz voivodeship). Seven breams weighing 530-1530 g, measuring 29/35-41/49 cm in lenght (longitudo corporis, longitudo totalis). In all fishes there was a strong protrusion of the cornea that showed small white spots, visible with naked eye (Phot. 1)...
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