Presence of selected pathogens on the gills of five wrasse species in western Norway

Overview
TitlePresence of selected pathogens on the gills of five wrasse species in western Norway
AuthorsSteigen A, Nylund A, Plarre H, Watanabe K, Karlsbakk E, Brevik Ø
TypeJournal Article
Journal NameDiseases of aquatic organisms
Volume128
Issue1
Year2018
Page(s)21-35
CitationSteigen A, Nylund A, Plarre H, Watanabe K, Karlsbakk E, Brevik Ø. Presence of selected pathogens on the gills of five wrasse species in western Norway. Diseases of aquatic organisms. 2018 Mar 22; 128(1):21-35.

Abstract

The objective of this study was to identify gill pathogens in Labridae (wrasse) species used as cleaner fish to control salmon louse in western Norwegian aquaculture. Wrasse are often moved over long distances, raising issues of fish health, welfare and pathogen transmission. Histological examination and real-time RT-PCR analysis of the gills from Centrolabrus exoletus, Ctenolabrus rupestris, Labrus bergylta, L. mixtus and Symphodus melops revealed several pathogens: a new species of Ichthyobodo, Paramoeba perurans, microsporidia, trichodinids, Hatschekia spp., Candidatus Similichlamydia labri and 2 putative new species of Chlamydiae. Cand. S. labri or closely related bacteria were present on most wrasse specimens. Epitheliocysts on the gills of L. mixtus contained large inclusions (120 µm) with actiniae radiating from the inclusion membrane. A possible member of the Candidatus family Parilichlamydiaceae was present at a high prevalence on the gills of L. mixtus, L. bergylta and C. rupestris. Sequencing the 16S rRNA gene showed 93.9% similarity to Cand. S. labri and 96.8% similarity to Cand. Parilichlamydia carangidicola from the gills of Seriola lalandi. This bacterium probably represents a new species within the order Chlamydiales, family Cand. Parilichlamydiaceae. The other Chlamydiae detected on gills of S. melops could represent a new species in Cand. genus Syngnamydia. Ichthyobodo sp. and Paranucleospora theridion were detected on the gills of nearly all individuals, while Paramoeba spp. were detected on the gills of L. bergylta and L. mixtus. Trichodinids, microsporidia and parasitic copepods had low prevalence. Viral haemorrhagic septicaemia virus was not detected.

Author Details
Additional information about authors:
Details
1A Steigen
2A Nylund
3H Plarre
4K Watanabe
5E Karlsbakk
6Ø Brevik
Properties
Additional details for this publication include:
Property NameValue
Journal CountryGermany
Publication TypeJournal Article
Language Abbreng
LanguageEnglish
Elocation10.3354/dao03198
DOI10.3354/dao03198
Journal AbbreviationDis. Aquat. Org.
Publication Date2018 Mar 22
pISSN0177-5103
ISSN0177-5103
Publication ModelPrint
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DatabaseAccession
PMID: PubMedPMID:29565251