DAO 88:161-167 (2010)  -  DOI: https://doi.org/10.3354/dao02156

NOTE
Ribosomal RNA gene sequences confirm that protistan endoparasite of larval cod Gadus morhua is Ichthyodinium sp.

Alf Skovgaard1,*, Stefan Meyer2, Julia Lynne Overton3, Josianne Støttrup3, Kurt Buchmann1

1Section of Fish Diseases, Department of Veterinary Disease Biology, University of Copenhagen, Stigbøjlen 7, 1870 Frederiksberg, Denmark
2Institute for Hydrobiology and Fisheries Science, University of Hamburg, Olbersweg 24, 22767 Hamburg, Germany
3Section for Coastal Ecology, National Institute of Aquatic Resources, Technical University of Denmark, Jœgersborg Alle 1, 2920 Charlottenlund, Denkmark

ABSTRACT: An enigmatic protistan endoparasite found in eggs and larvae of cod Gadus morhua and turbot Psetta maxima was isolated from Baltic cod larvae, and DNA was extracted for sequencing of the parasite’s small subunit ribosomal RNA (SSU rRNA) gene. The endoparasite has previously been suggested to be related to Ichthyodinium chabelardi, a dinoflagellate-like protist that parasitizes yolk sacs of embryos and larvae of a variety of fish species. Comparison of a 1535 bp long fragment of the SSU rRNA gene of the cod endoparasite showed absolute identity with I. chabelardi, demonstrating that the 2 parasites are very closely related, if not identical. This finding is discussed in relation to some morphological differences that appear to exist between I. chabelardi and the cod endoparasite.


KEY WORDS: Fish egg · Yolk sac parasite · Endoparasite · Gadus morhua · Ichthyodinium


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Cite this article as: Skovgaard A, Meyer S, Overton JL, Støttrup J, Buchmann K (2010) Ribosomal RNA gene sequences confirm that protistan endoparasite of larval cod Gadus morhua is Ichthyodinium sp.. Dis Aquat Org 88:161-167. https://doi.org/10.3354/dao02156

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