TT #212 · Parashas Reeh · Fourth Aliyah · Passuk 14:21
You shall not eat any carcass; give it to the stranger within your gates, that he may eat it, or sell it to a foreigner; for you are a holy people to Hashem your God. You shall not boil a kid in its mother’s milk.
Torah Temimah points to Keritot 21a / Torah Temimah.
Sefaria — Torah Temimah on Deuteronomy 14:21
English: “Any carcass” — this includes the carcass of a koy.
Ribbuy (TT / Keritot) — the koy is brought under the neveilah prohibition.
Even the koy’s carcass is included in the ban on neveilah.