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Infection of eel Anguilla anguilla (L.) and smelt Osmerus eperlanus (L.) with Anguillicola crassus (Nematoda, Dracunculoidea) in the Netherlands from 1986 to 1992
Haenen, O.L.M.; Van Banning, P.; Dekker, W. (1994). Infection of eel Anguilla anguilla (L.) and smelt Osmerus eperlanus (L.) with Anguillicola crassus (Nematoda, Dracunculoidea) in the Netherlands from 1986 to 1992. Aquaculture 126(3-4): 219-229. http://dx.doi.org/10.1016/0044-8486(94)90038-8
In: Aquaculture. Elsevier: Amsterdam; London; New York; Oxford; Tokyo. ISSN 0044-8486; e-ISSN 1873-5622, meer
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Parasites
Taxa > Species > Introduced species
Anguilla anguilla (Linnaeus, 1758) [WoRMS]; Anguillicola crassus Kuwahara, Niimi & Itagaki, 1974 [WoRMS]; Osmerus eperlanus (Linnaeus, 1758) [WoRMS]
Marien/Kust; Brak water; Zoet water |
| Auteurs | | Top |
- Haenen, O.L.M.
- Van Banning, P., meer
- Dekker, W.
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| Abstract |
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 Anguillicola crassus (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 IJsselmeer, 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. Smelt, which is a paratenic host for larvae of A. crassus 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. |
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