CEO; Economic Analysis of Bottom Trawling - GETS Bottom trawling, as well as longlining and other fishing methods, are also notoriously unselective, catching and killing large numbers of non-target species, or bycatch, such as non-target fish species, corals, sponges, sea turtles, seabirds, and marine mammals. Alaska Groundfish Research. While alternate methods (such as shrimp farming) exist for catching organisms that would normally be trawled, these . This paper describes an approach for addressing these questions for bottom trawling activities in the SPRFMO Convention Area. Commercial fishing methods - Sustainable Fisheries UW There are several types of bottom trawl net, all of which use a cone-like net with at least one closed end (the cod-end) that holds the catch. The problem with bottom trawling as a fishing method is that it's indiscriminate in what it catches. Even in heavily trawled regions, effort is not evenly distributed. Bottom trawling: how to empty the seas in just 150 years Those environmental impacts are crucially . Heavy nets 100 yards wide, equipped with weighted rollers and steel doors . . trawling restrictions not only signal a regional commitment towards ocean responsibility, but also a move towards recognizing bottom trawling as an unsustainable fishing practice. With pulse gears, Benthic trawling is towing a net at the very bottom of the ocean. To reduce fishing impacts, alternative bottom trawl gears such as pulse fishing gears are being investigated (Van Marlen 60 et al., 2 014; McConnaughey et al., 2020) . Evaluation of New Zealand's High-Seas Bottom Trawl Closures Using ... The poster child for slow-maturing deep-sea fish being wiped out by bottom trawling is the orange roughy.