scales
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Kosher Fish Variations
Leviticus 11:9 Of all that which is in the water, whether in the ocean or in the rivers, you may eat [only] those that have fins and scales. אֶת־זֶה תֹּאכְלוּ מִכֹּל אֲשֶׁר בַּמָּיִם כֹּל אֲשֶׁר־לוֹ סְנַפִּיר וְקַשְׂקֶשֶׂת בַּמַּיִם בַּיַּמִּים וּבַנְּחָלִים אֹתָם תֹּאכֵלוּ׃ 11:10 And all that which does not have fins and scales, whether in…