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To be kosher, a fish must have fins and scales (Leviticus ch.11). So for example salmon has both and is kosher. Some eels, however, are not because while they have scales they have no fins. The sanitary reason is that fish without fins tend to be bottom dwellers and bottom dwellers, like lobsters, clams and oysters, tend to live in shallower waters and feed on anything they can find -- and in ancient times shallow waters was where human waste washed into the sea....Need I say more?

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12y ago

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