1Heat oven to 425°.
2Melt 1 tablespoon butter in 10-inch nonstick skillet over medium-high heat. Cook onion and carrots in butter 2 minutes, stirring frequently. Stir in bell pepper. Cook 1 minute, stirring frequently. Stir in zucchini, 1 teaspoon lemon peel, the salt and tarragon. Cook 1 minute, stirring frequently; remove from heat.
3Cut fish into 4 serving pieces (skin can be left on). If fish has skin, place fish skin side down in ungreased rectangular baking dish, 11x7x1 1/2 inches. Mix remaining ingredients; spread over fish. Spoon vegetable mixture around fish.
4Bake uncovered 20 to 25 minutes or until fish flakes easily with fork. Remove skin from fish before serving if desired.