As with all such things, the question isn't always "can we reduce consumption" but "can we improve efficiency" I don't know the right answer, but hypotheticall

As with all such things, the question isn't always "can we reduce consumption" but "can we improve efficiency" I don't know the right answer, but hypothetically if 50% of fishing is waste, then reducing demand/consumption by 5% won't be as impactful as reducing waste by 20%. And unlike the massive amount of consumers who all have to make different individual choices to achieve that, efficiencies in industries is likely to be centralized in a few big players.