The average cumulative mortality rate for seed oysters in France is 62.7% on a national level with high regional fluctuation. This is 2 points higher than the previous month (see previous) and also 2 points higher than the same bulletin last year : The 27/07/2016 bulletin recorded 60.5% as the national cumulative average.
Juvenile and adult oysters are reported as having much lower mortality rates (4.2% and 3.5% respectively) although higher than the previous bulletin (see previous). However this remains inferior than juvenile mortality rates for the same period in 2016 but above adult levels (6.5% for juvenile oysters and 2.8% for adult oysters on 27/07/2016 bulletin).
Overall therefore according to the Ifremer monitoring programme up to end of July, mortalities for both 2016 and 2017 show approximately similar rates.