Trawler fishing is devastating for the local ecology, we just don't see the damage - to quote [1], page 16:
> Seabed habitats are under significant pressure across European seas from the cumulative impacts of demersal fishing, coastal developments and other activities. Preliminary results from a study presented in SWD(2020) indicate that about 43% of Europe’s shelf/slope area and 79% of the coastal seabed is considered to be physically disturbed, which is mainly caused by bottom trawling. A quarter of the EU’s coastal area has probably lost its seabed habitats.
Honestly I'm pretty much in favor of banning trawler fishing and the import of trawler-fished fish into the European Union, even if it's just to protect our fiber links.
[1] https://commission.europa.eu/document/download/720778d4-bb17...