TT #113 · Parshas Shemini · Aliyah 6 · Passuk 9
English: These you may eat among all that live in water: anything in the water, whether in the seas or in the streams, that has fins and scales—these you may eat.
Chullin 66b.
E-Daf.com — Chullin 66b (Tsurras Hadaf)
אֶת זֶה תֹּאכְלוּ וְגוֹ׳. כְּתִיב אֶת זֶה תֹּאכְלוּ מִכֹּל אֲשֶׁר בַּמַּיִם וּכְתִיב כֹּל אֲשֶׁר לוֹ סְנַפִּיר וְקַשְׂקֶשֶׂת בַּמַּיִם בַּיַּמִּים וּבַנְּחָלִים אֹתָם תֹּאכֵלוּ.
Textual harmonization — The parallel formulations are read together to establish the identifying signs of permitted aquatic creatures.
The wording distinguishes the permitted fish in seas and streams from small aquatic creatures in enclosed waters.