If your favourite fish is salmon, tuna or cod (yes, sushi-eaters, I’m looking at you), you’re part of the problem.
It’s not so much of an over-fishing problem anymore, since fishers in most countries adhere to strict quotas. The problem is more that the quota system doesn’t really work.
Trawlers go out onto the ocean, drop net and scoop up everything that gets caught in that net. But they can only bring ashore anything that is within their quota. If they’ve already met their quota of cod, and there’s cod in that net, what happens to it? It gets dumped, usually dead, back into the sea. So besides doing absolutely nothing to stop the “overfishing” of cod, it wastes a lot of otherwise edible fish that could be going to feed people. In most cases, UK fishers are having to dump 50% of their catch because they are not legally allowed to bring it onto land. They can still *catch* it, they just can’t sell it.