title: Trichodina sp. (Ciliophora: Peritrichida) in eel Anguilla anguilla in recirculation systems in denmark: host-parasite relations.
abstract: Farmed eel cultured in recirculation systems in Denmark were found infected by Trichodina jadranica Raabe, 1958. Associations between parasite abundance and fish size was examined in 2 different production systems. In one system, stocked with relatively well-nourished eels (3 to 31 g), most of the parasites (66%) were found on the dorsal part on the skin and relatively few were found on the gills (approx. 8%). The infection level was significantly positively correlated both with fish weight and length. In the other system, stocked with relatively malnourished small eels (0.5 to 4 g), significantly more parasites (0.06 +/- 0.02 [SD]) were present on fish with a low condition factor than on fish with a higher condition factor (0.13 +/- 0.01 [SD]). In this eel stock the vast majority of the trichodines were found on the gills.
authors.affiliation: Danish Institute for Fisheries Research, Department of Marine Ecology and Aquaculture, Fish Diseases Laboratory, Frederiksberg.
authors.forename: H C
authors.initials: HC
authors.lastname: Madsen
authors.forename: K
authors.initials: K
authors.lastname: Buchmann
authors.forename: S
authors.initials: S
authors.lastname: Mellergaard
mesh_terms: D000811:Anguilla / Q000469:parasitology*; D000818:Animals; D016798:Ciliophora / Q000302:isolation & purification / Q000502:physiology* / Q000648:ultrastructure; D016770:Ciliophora Infections / Q000469:parasitology / Q000662:veterinary*; D003718:Denmark; D005393:Fish Diseases / Q000469:parasitology*; D005880:Gills / Q000469:parasitology; D006790:Host-Parasite Interactions; D012867:Skin / Q000469:parasitology