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Concentration of TTX (mean ± SD, n = 3, except on 12 June in B due to an injection issue) in the oysters sampled in 2019 from (A) the Bay of Veys (Normandy, bi-weekly sampling) and (B) the Bay of Brest (Brittany, weekly sampling). The LOD (red line) and LOQ (black line) were represented. No bar means the value was <LOD (sampling was carried out for the periods shown). * Note that a second lot of oysters was used from this date, due to an unexplained mortality event.
