Fig. 1

Recommended method for storing an eDNA filter sample using silica gel beads. A filter membrane is folded in half with the filtride side in and placed inside a paper coin envelope. This, in turn, is placed in a sealable plastic bag containing silica gel beads, the air removed and firmly sealed before storage. It is easy to monitor the moisture content of the sample as the orange beads turn dark green when there is too much moisture and need to be replaced or the beads regenerated as per the manufacturer’s instructions