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To be kosher, a fish must have both fins and scales - some fish, such as lampreys (and also whales which were considered fish in ancient times, though we now know that they are of course mammals) do not, and so are treif (not kosher). Flying fish have both and as such are kosher.

There's a good list of both kosher and treif fish at http://www.kosherquest.org/bookhtml/FISH.htm

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16y ago

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