The most important pelagic species are herring, mackerel and sprat, which are found in large, always moving shoals. Modern onboard echo sounders and sonar equipment locate the fish several miles away. When the fish has been caught, it is pumped into the fish tanks of the vessel, where it is kept in refrigerated sea water, which constantly is recirculated at a temperature of -0,5 degr.. Cel. Discharging is carried out by vacuum pumping directly into the onshore production plant. Pelagic fishing is carried out without contact between the fishing gear and the sea-bed.