Table 2

Overview of number of broodstock oysters screened at Wageningen Marine Research; number of oysters without Bonamia infection used in hatcheries (RvY = Roem van Yerseke and ZS = Zeeschelp); negative Bonamia results for larval batches released and seed produced by these pre-screened broodstock oysters. Number of pools for pooled samples is presented in parenthesis.

Screening date Total # oysters # Neg Sampling date # Larvae batches # Neg # Seed # Neg Hatchery
30 April 2018 149 137 June–August 2018 9 9 (2) (2) RvY
30 April 2018 149 137 28 July 2019 12 12 (3) (3) RvY
7 October 2019 200 136 RvY
11 May 2020 145 105 June and July 2020 9 9 240 (56) (56) ZS
12 April 2021 182 163 13 July 2021 145 (27) (27) RvY
17 May 2021 180 149 August 2021 150 (30) (30) ZS

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