MAURITANIA. January 2007. Aboard the Russian trawler "Balandis". This is the image than th echo sonar installed at the entrance of the net (see pictures G062 or G063) when it works under the water is giving. The red spot is an enormous school of fishes (carangue). The red line under the spot is the bottom of the sea (approx 500 meters). The oval red traces around the spot going to the surface to the bottom is the external limits of the net. It means than the incredibly huge mouth of the net goes to the surface to the bottom and "eat " every thing.