I'm sure it is a oversight by developers. Or maybe because San Myshuno's waters are dirty?
Perhaps the recipe could be set as any tuna, so you can have City Living tuna used for a tuna maki or use that Island Living tuna for a less ethical tuna maki.
But for now, let's calm down. Catching virtual endangered fishes won't affect real endangered fishes. Many players don't want a perfect utopian world, but they also like to have evil sims to do... evil things. The way how players play The Sims is up to them. That's the magic of sandbox games! And most of the time, players won't suddenly start acting like sims (think how many fire deaths would there be then!).
After all, 99% of players won't be like "I like how sims can catch endangered species so I must do it too!"
