Mesorat%20hashas for Chullin 132:24
מה כשהתיר במפורש לא התיר אלא בכלים
[in the seas and in the rivers], which signifies that [those cree things found] in the seas and in the rivers, if they have [fins and scales) you may eat, and if they have not [fins and scales] you may not eat, whereas all those found in [the water of] vessels you may eat, even though they have not [fins and scales].
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