And some methods are inherently destructive
Some fishing methods are so destructive that they should be banned. Dynamite fishing, bleach fishing, poison fishing… humans can be very resourceful.
But on the largest scales, the most destructive have been driftnets and gillnets. They clear an area entirely of life. Set in the path of large migrations, they capture seabirds, squid, salmon, tuna, swordfish, sea turtles, dolphins…anything that can’t swim through a 2″ hole. Most of what is captured is discarded to the sea bottom, since it isn’t worth hold space in the fishing boat to keep it.
Shark finning is going on at a huge rate, and is clearing the seas of these important apex predators. The rest of the shark isn’t used… the fin is cut off and they’re discarded, for a high-priced soup reputed to be healthy. Statistically, humans have little to fear from sharks; while sharks are being eradicated by humans.
Bottom trawlers leave the bottom sea-life communities looking like the surface of the moon, willing to destroy very much for very little.
And these reduced marine populations must somehow cope, in their diminished state, with oceans we are polluting, heating, fouling, and acidifying.
We’ve reached the point at which something has to change, or the seas will no longer support the sea life we evolved alongside.