Aquarium fishing is a small industry, mostly local people, and not terribly lucrative.  The mainland animal rights group & the snorkel tour operator who have been pushing for this bill, meanwhile, are extremely wealthy and have a long history of lobbying & political donations.  If you do follow the money, you won't find that Ige has been paid off by fishermen.  He did this because he listens to science and has the interests of locals at heart.