trawl, usually much larger than the bottom trawl, designed and rigged to work in midwater, including surface water. The front net sections are very often made with very large meshes or ropes, which herd the fish schools towards the net aft sections. The fishing depth is usually monitored by means of a net sounder (netsonde). They may be towed by one or two boats., pelagic trawl - a towed net designed to catch fish species schooling at mid-water levels, including waters close to the surface