Figure 6. The survey trawl with a 7 mm meshed inner net made of polyamide (PA) 140 mm meshed PA net in the mouth, and 200 mm meshed outer support net in polyethylene (PE) (A). Steel beam with rigging (B) and underwater image captured during towing showing the mouth opening (C). See also Figure 2. In Krafft et al.2018.
