Abstract
The question of whether small freshwater fish are infected by Anguillicola crassus, a parasitic swimbladder nematode normally found in eels, was investigated. Various small freshwater fish that are preyed upon by eels were examined for larvae of A. crassus. Freshwater smelt ( Osmerus eperlanus), ruffe ( Gymnocephalus cernuus), roach ( Rutilus rutilus), bream ( Abramis brama), perch ( Perca fluviatilis), zander ( Stizostedion lucioperca), and three-spined stickleback ( Gasterosteus aculeatus) were caught from a freshwater lake in The Netherlands. Examination revealed that, except for roach and bream, all the fish were infected with these nematodes. We suggest that in addition to nematode-infected crustaceans, which are the known route of infection for eels, these small fish may constitute another route of infection.
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