Flakey white fish fillets are typically used to make fish tacos because they are mild in flavor, cook quickly and are relatively inexpensive. And we highly recommend wild-caught. Cod is a popular choice, as it's a mild white fish loaded with heathy Omega-3s without the ‘fishy’ flavor that can be found in some seafood. Other mild white fish that would work are tilapia, snapper, halibut, or mahi mahi.