Leviticus 11:12

'כל אשר אין לו וגו‎ WHATEVER HATH NO [FINS] etc. — For what purpose is this repeated? Because I might think that in verse 9 I have only the law that permits the eating of a fish which brings up its signs of cleanness (i. e. fins and scales) to dry land. Whence, however, could I learn that if it sheds them whilst it is in the waters such is also permitted as food? Therefore it states here: whatever hath no fins and scales in the water [that shall be an abomination to you]”. Thus, if it did have them whilst it was in the water, even though it shed them when it came up on dry land, it is permissible as food! (Sifra, Shemini, Section 3 11).

Whatever has no fins or scales in the waters, that shall be an abomination to you.

כֹּ֣ל אֲשֶׁ֥ר אֵֽין־ל֛וֹ סְנַפִּ֥יר וְקַשְׂקֶ֖שֶׂת בַּמָּ֑יִם שֶׁ֥קֶץ ה֖וּא לָכֶֽם׃