Mortality in France started exceptionally early this year in May in the Mediterranean and Arcachon and progressed steadily North to affect most areas by mid June.
There are some good web resources so to save repeating this is mainly just a post with links:
The most up to date collated info is here (thanks to Tony Legg in Jersey for supplying this link):
To view any article in English, install the Google toolbar and press Translate - it does an amazingly good job!
http://aquaculture-aquablog.blogspot.com/2009/05/mortalite-des-huitres-2009-revue-de.html
IFREMER Review article
Review article about C.gigas global transfers and mortality
'Observatory' 2009 experiments in the field
Info 3- 17th June
Info 4- 1st July
IRELAND
Oyster mortalities reported in 10 Irish bays (Marine Institute)
Ireland update (undated - early August?)) (Marine Institute)