1) For slaw, combine green onions, cilantro, lime juice, oil, garlic, sugar and Cajun seasoning; whisk until blended. Add slaw mix; toss to coat. Cover; refrigerate until ready to serve.
2) Heat skillet over medium heat 5 minutes. Moisten fish filets with water and sprinkle with Cajun seasoning. Lightly spray pan with vegetable oil. Place filets in pan; cook over medium heat 10-12 minutes or until fish flakes easily with fork, carefully turning once. Remove from heat. Flake fish into bite size pieces.
3) Cut avocado in half lengthwise; remove seed and cut flesh away from skin. Cut one avocado half into slices. (Reserve remaining half for another use.) Warm tortillas in microwave. Top tortillas evenly with slaw mixture and fish. Grate radishes evenly over fish. Top with avocado slices and sprinkle with additional cilantro if desired.