yeah visit a farm in BC....
check out
the huge pile of antibiotic-laced salmon shit under the farm and corresponding dead zone in the water
the sea-lice infested wild smolts
the dead sea lions with bullets in the head washing up on local beaches (hey, if a predator attacks your herd you kill it right, just like wolves and ranching)
what you won't see is the factory fishing fleet driftnetting in the south pacific and grinding up "unpalatable" species to make fishmeal to feed the salmon: 10 tons of other fish species makes less than 1 ton of farmed salmon, an even worse energy efficiency than a diesel 2-stroke!