Trichodina sp. ( Ciliophora: Peritrichida ) in eel Anguilla anguilla in recirculation systems in Denmark : host-parasite relations

• Published in: Diseases of Aquatic Organisms
• Main Authors: Madsen, H.C.K., Buchmann, Kurt, Mellergaard, Stig
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2000
• Subjects: Fiskesundhed; /dk/atira/pure/sustainabledevelopmentgoals/zero_hunger; name=SDG 2 - Zero Hunger; Anguilla anguilla
• Online Access: https://orbit.dtu.dk/en/publications/dd9af156-5a9b-4dfa-a912-e26e1c15b9d3; https://doi.org/10.3354/dao042149; https://backend.orbit.dtu.dk/ws/files/6408921/Madsen.pdf

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.