Wash hands with warm, soapy water for 20 seconds.
Combine yogurt, mayonnaise, cilantro, and 2 teaspoons of taco seasoning in a small bowl. Set in the refrigerator.
Mix oil, lemon juice, and 1 teaspoon of taco seasoning in another bowl. Drizzle over fish and bake according to package instructions.
Warm tortillas for 20-30 seconds in the microwave, if desired.
Fill tortillas with fish. Top with cabbage, tomatoes, a squeeze of lime, and yogurt sauce from refrigerator.