Ecomare

You can see a large school of fish on the sonar. With a net up to 2 kilometers long and 150 meters deep, you can encircle the entire school. You then pull on the groundrope to close the net so that the entire school can be hauled in. This is purse seining. In the North Sea, it is mostly the Norwegian industrial fleet which catches young herring, sprat and Norway pout in this fashion. Danish industrial fishermen let the purse seines sink to the bottom to catch large amounts of less sandeel.