The only way I kill fish, if only feeding them, is by throwing them against somethign hard. They die instantly. It's kind of gruesome especially with fry, but I'd rather do that then put them in the freezer, which they die an hour or two later.
Giving them to an lfs would probably be the best thing to do. Don't know about the stores where you are, but if I gave some fry to my lfs they'd just throw them in with the fiddlers for food 0.0. Hopefully yours would at least try to raise them.
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