Every year, Wageningen Marine Research carries out acoustic studies of herring in the North Sea in order to estimate the size of the herring and sprat population. But first the team needs to align the devices for the echolocation using a ‘calibration ball’. You need the help of several people to attach this ball to the lines. It is even more of a challenge doing this while keeping to the corona rules.
Corona-proof at sea
Scientists on board the fisheries research ship De Tridens try to tie the lines to their measuring equipment while keeping a coronavirus-proof distance of 1.5 metres apart.
Photo: Bram Couperus, WMR