- Netherlands Institute for Fisheries Research (RIVO)
Infection of eel Anguilla anguilla (L.) and smelt Osmerus eperlanus (L.) with Anguillicola crassus (Nematoda, Dracunculoidea) in the Netherlands from 1986 to 1992
Haenen OLM, van Banning P, Dekker W
Dutch wild eels [Anguilla anguilla (L.)] and smelt [ Osmerus eperlanus (L.)] from freshwater and saltwater areas in the Netherlands were collected from 1986 to 1992 and their swimbladders were examined for Anguil/icola crassu.o; (Nematoda, Dracunculoidea) and for parasite-related pathological changes. Throughout the 6-year sampling period, young eels (up to 17 cm) showed severe pathological changes due to the parasite. The prevalence of Infection in larger eels (23-34 cm) showed the highest prevalence between 1987 and 1988, and the highest intensity (i.e. number of parasites per infected fish) between 1988-1989. After 1989 the prevalence of the parasite decreased, and the lesions became less severe. Larger eels (23-34 cm) from the Waddenzee (salt water), which is close to the !Jsselmeer, showed a high prevalence of the parasite from 1987 to 1990, although the intensity of infection decreased from 1987 onwards, as did the percentage of fibrotic swimbladders after 1988. Smel~ which is a paratenic host for larvae of A. crassu.o; and which is a prey for large eels, showed a sharp decrease In prevalence of the parasite shortly after 1988. Thereafter the prevalence stayed rather constant at about 40% of the smelt population. No pathological changes were found in the smelt.
1994, Volume: 126, number: 3-4, pages: 219-229
UKÄ Subject classification
Fish and Aquacultural Science
Permanent link to this page (URI)