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Diseases of Aquatic Organisms

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DAO 140:203-208 (2020)  -  DOI:

First detection of Francisella halioticida in mussels Mytilus spp. experiencing mortalities in France

Maud Charles1,2,*, Antonio Villalba3,4,5, Gary Meyer6, Suzanne Trancart2, Coralie Lagy2, Ismaël Bernard7, Maryline Houssin1,2

1Normandie Université, Université de Caen Normandie, FRE BOREA, CNRS-2030, IRD-207, MNHN, UPMC, UCN, Esplanade de la Paix, 14032 Caen Cedex 4, France
2LABÉO Frank Duncombe, 1 Route de Rosel, 14053 Caen Cedex 4, France
3Centro de Investigacións Mariñas (CIMA), Consellería do Mar, Xunta de Galicia, 36620 Vilanova de Arousa, Spain
4Departamento de Ciencias de la Vida, Universidad de Alcalá, 28871 Alcalá de Henares, Spain
5Research Centre for Experimental Marine Biology and Biotechnology (PIE), University of the Basque Country (UPV/EHU), 48620 Plentzia, Basque Country, Spain
6Fisheries and Oceans Canada, Pacific Biological Station, Aquatic Animal Health Laboratory, 3190 Hammond Bay Road, Nanaimo, BC V9T 6N7, Canada
7Eurêka Mer, 13 Cité des gardiens de phare,22740 Lézardrieux, France
*Corresponding author:

ABSTRACT: This note describes the first detection of the bacteria Francisella halioticida in mussels Mytilus spp. from locations in Normandy and northern Brittany (France) experiencing high mussel mortalities, while it was not detected in the Bay of St Brieuc (northern Brittany), an area which was not affected by abnormal mussel mortality. The distribution of the bacteria in mussels seems to be restricted to inflammatory granulomas as observed in Yesso scallops Mizuhopecten yessoensis from Canada and Japan. F. halioticida has been identified as being involved in mass (>80%) mortality of abalones Haliotis gigantea in Japan and high (up to 40%) mortality of Yesso scallops Mizuhopecten yessoensis in Canada as well as in lesions reducing marketability of Yesso scallops in Japan. The impact of this bacterium on the health of mussels needs to be investigated in future research, especially since the cause of high mussel mortalities that have been occurring in France for the past few years is still undetermined.

KEY WORDS: Francisella halioticida · Mussels · Granulocytomas · Polymerase chain reaction · In situ hybridisation

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Cite this article as: Charles M, Villalba A, Meyer G, Trancart S, Lagy C, Bernard I, Houssin M (2020) First detection of Francisella halioticida in mussels Mytilus spp. experiencing mortalities in France. Dis Aquat Org 140:203-208.

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