Ponds are visited on four separate occasions, between the months of mid-March and mid-June, with at least two of these visits being undertaken between mid-April and mid-May. Four different survey methods can be used during the each of the site visits including bottle trapping, egg searching, a torch survey and netting. After four surveys, if the presence of GCN is confirmed in ponds, then 2 further surveys per confirmed pond are undertaken to collect sufficient data to estimate the GCN population. This information is required to form a well-informed mitigation plan.