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Parasite Infections in Danish Trout Farms

Acta Veterinaria Scandinavica volume 36, pages 283–298 (1995)Cite this article

Abstract

Samples from 5 Danish freshwater trout farms rearing rainbow trout (Oncorhynchus my kiss) were examined for parasite infections from October 1993 until November 1994 and recorded parasites are listed. In addition, results from an examination of a mariculture net cage system are presented as well. A total of 10 metazoan and 10 protozoan parasites were recorded. The metazoans included Gyrodactylus derjavini, Gyrodactylus salaris, Eubothrium crassum, Triaenophorus nodulosus, Proteocephalus sp., Diplostomum spathaceum, Tylodelphus clavata and Argulus foliaceus from the freshwater farms. The protozoans Hexamita salmonis, Ichthyobodo necator, Ichthyophthirius multifiliis, Apiosoma sp., Epistylis sp., Trichodina nigra, T. mutabilis, T. fultoni, Trichodinella epizootica, and an Ichthyophonus like intestinal parasite were also detected in the freshwater trout farms. Based on lectin binding studies, few fish were found positive for the myxosporean parasite PKX although no clinical cases were reported. In the mariculture system, Lepeophtheirus salmonis and Caligus elongatus were found.

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Acknowledgments

This work was supported by the Danish Agricultural and Veterinary Research Council and is a part of the Danish programme on Disease prevention, genetics and nutrition in rainbow trout production. The authors are indebted to Steen Møller (National Institute of Animal Science, Tjele), Jon From (Inland Fisheries Laboratory, Silkeborg), Viggo Hørlyck, Christian Graver, Per Aarup (Danish Trout Culture Research Station, Brøns) and T. Nielsen (Brande), who collected a considerable number of the examined fishes. Sincere thanks go to Dr. Göran Malmberg (University of Stockholm) who kindly guided K. Buchmann into the Gyrodactylus taxonomy and determined or verified our determination of Gyrodactylus species. The cooperation of Dr. Ken MacKenzie (Marine Laboratory, Aberdeen) is likewise appreciated. Dr. N.J. Olesen (National Veterinary Laboratory, Århus) provided instructions on the modified lectin binding assay.

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  1. Department of Veterinary Microbiology, Section of Fish Diseases, Royal Veterinary and Agricultural University, 13 Bülowsvej, DK-1870, Frederiksberg C, Denmark

    Κ. Buchmann, A. Uldal & H. C. Κ. Lyholt

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  1. Κ. Buchmann
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  2. A. Uldal
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  3. H. C. Κ. Lyholt
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Buchmann, Κ., Uldal, A. & Lyholt, H.C.Κ. Parasite Infections in Danish Trout Farms. Acta Vet Scand 36, 283–298 (1995). https://doi.org/10.1186/BF03547675

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Acta Veterinaria Scandinavica

ISSN: 1751-0147