Never heard of it so had a brief perusal. (it's trailing electric wires in front of the net to stun/catch bottom dwelling fish/crustaceans)
I see the EU actually pays to convert trawlers to 'pulse'. £300,000 each.
Mind you, beam trawling sounds worse to me (dragging heavy chains in front of the net) Must kill more fish than it catches and damages the sea bed. (presumably)
Neither sounds very sporting but then I don't eat fish. I suppose if you want relatively cheap flounders and whatnot they have to be winkled out (boom boom) somehow.