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    What are the signs of a kosher fish?

    Fins and scales

    Source: Vayikra 11:9

    In detail

    A kosher fish must have both fins (snapirim) and scales (kaskasim). Scales must be removable without tearing the skin. Examples of kosher fish: salmon, tuna, carp, tilapia. Non-kosher examples: catfish (no scales), shrimp, lobster, crab (no fins or scales — these are crustaceans, not fish). Swordfish is debated among authorities.

    Full study guide: Kashrut

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