actually some fish are tank raised now. A company called ORA is one buisness that does this for fish AND corals! they can be a little more pricey, but they aren't harvested and often they survive better in an established home aquarium! ask your local pet store if they can get ORA(Oceans, Reefs, and Aquariums) raised fish and corals.
BTW i think the method you are refering to is some form of cyanide that is introduced to an area set for collection. It supposed to cause the fish to be "stunned" but often just causes them to "die"... this practice is now heavily looked down apon and a lot of companys refuse to sell fish caught in this manner.
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