Just before lockdown a lake was designated an eel reserve because eel numbers are falling. The government put $4.5 million into a plan to save the eels, and this involved sophisticated pumps being installed at the lake inlet which would not hurt any eels which managed to get in. Our task was to build a wooden structure to sit inside the concrete bunker at the inlet. The wooden structure had to be covered in fine netting, and a large sock of netting had to extend from the frame. This is to capture any fish that pass through, and a passive integrated transponder (PIT) system is in place at the site to assess the behaviour of the tagged eels at the pump. All fish captured in the sock net will be measured and checked for any injuries.