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A global analysis of the impacts of bottom trawling found that the impact on seabed biota was strongly dependent on the type of gear used, with otter trawls estimated as having the smallest impact and removing 6% of biota per pass while hydraulic dredges had the largest impact and removed 41% of biota per pass. [18]
These practices are destructive because they impact the habitat that the reef fish live on after the fish have been removed. Bottom trawling, the practice of pulling a fishing net along the sea bottom behind trawlers, removes around 5 to 25% of an area's seabed life on a single run. [12] This method of fishing tends to cause a lot of bycatch. [11]
Trawling is controversial because of its environmental impacts. Because bottom trawling involves towing heavy fishing gear over the seabed, it can cause large-scale destruction on the ocean bottom, including coral shattering, damage to habitats and removal of seaweed. [citation needed] Porpoise Caught in Fishing Net
Bottom trawling in Canadian waters have shown the destructive effects of the fishing method. With the establishment of Baffin Bay fishery in 1996, feeding grounds for narwhals in the Canadian Arctic were impacted by vast benthic damage as a result of bottom trawling. [ 20 ]
6 Environmental impacts. 7 See also. 8 References. ... is an area of the ocean floor where seepage of fluids rich in ... Deep bottom trawling has severely damaged ...
Bottom trawling, microplastic pollution, and industrial metals have slowly changed and altered the composition of the sea floor. Bottom trawling refers to a commercial deep sea fishing technique in which the equipment drags across the sea floor. [77] This has had an adverse effect on the seafloor as it changes the surface structure and composition.
Bottom trawling also poses a detrimental effects to the sea and using marine geology techniques can be helpful at mitigating them. [65] Bottom trawling, generally a commercial fishing technique, involves dragging a large net that herds and captures a target species, such as fish or crabs. [ 66 ]
The impacts of bottom trawling have been observed in three of the reefs in the QCB. [3] Trawling damage appears as parallel tracks 70–100 m apart that may extend for several kilometers. Each trawl track is 10 cm deep, 20 cm wide, and occurs at depths of 210–220 m.