Clean & Unclean Foods
God gives instructions in the Bible in Leviticus 11 & Deuteronomy 14, as to the clean meats we are allowed to eat, and the unclean meats we aren't. You might have heard this from your Jewish friend as eating "kosher."
So here is a short list of clean and unclean meats:
Deep Ocean Fish (Salmon, Tuna, Swordfish, Mahi Mahi, Tilapia, Cod)