Coat grill rack with nonstick cooking spray. Preheat grill to medium.
Combine 1 tablespoon of the Italian seasoning, salt, pepper, garlic, and 1/4 cup of the lemon juice in small bowl; pour over fish. Grill, covered with grill lid, 5 to 7 minutes or until fish flakes easily when tested with a fork.
Coat large skillet with cooking spray. Sauté onion, carrots, zucchini and squash 5 to 10 minutes or until tender. Stir in tomatoes, remaining Italian seasoning, and remaining lemon juice. Serve fish immediately over vegetables.
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