Migration patterns of third-stage <i>Anguillicola crassus</i> larvae, and pathogenesis of the lesions induced by third-stage larvae, was investigated in European eel <i>Anguilla anguilla</i> L. Young elvers (1g) were fed infected <i>Paracyclops fimbriatus</i> (Copepoda). Eel samples were collected and examined histologically at varying intervals during 6 mo post-infection period. Third-stage larvae (L-III) migrated directly through the intestinal wall and body cavity to the swimbladder within 17h post-infection. L-IV larvae were detected 3 mo post-infection, and immature adults were detected within 4 mo post-infection. The parasites occasionally showed aberrant migration paths. Pathological effects caused by the parasite...
