Preheat oven to 450°F. Place fish in shallow baking pan. Top with 1/4 cup salsa. Bake uncovered 10 minutes or until fish flakes with a fork. Wrap taco shells in foil and add to oven last 5 minutes, if desired.
Meanwhile, rinse and drain beans. Add corn and remaining salsa.
Divide greens among taco shells; top with black bean mixture, fish and cheese.
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