I believe sustainable fishing is either going to be very difficult or impossible, this is because of how many people are in the world and how difficult it would be to make people fish smarter and to stop overfishing. We overfish 50% of the fish caught.
Sadly every 8 tunas, 45 dolphins are caught by bycatch and this ridiculous, bycatch is causing one death every 2 minutes and with over 300,000 dolphins and small whales being killed by fishing nets and other fishing equipment. Longline and trawl fisheries kill over 300,000 seabirds each year. These accidental deaths, known as bycatch, are the result of birds becoming caught in fishing gear.
While Japan is fishing up tens of thousands of dolphins this is going to cause the population of dolphins to drop down a lot, possibly making dolphins go extinct. And that doesn't even include bycatch, they kill 20 thousand a year on purpose and worldwide fishing operations are catching about 80,000 dolphins every year per 1,000 tonnes of tuna and it's estimated that 174 dolphins on average per that 1,000 tonnes are getting trapped in nets.
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