1In 8-inch square microwavable dish, arrange fish, thickest parts to outside edges. Sprinkle with salt. Pour wine over fish. Cover with plastic wrap, folding back one edge or corner to vent steam. Microwave on high 6 to 8 minutes or until fish flakes easily with fork. Let stand covered 3 minutes; drain. Remove skin and bones; break salmon into 1-inch pieces.
2In large bowl, gently toss salmon with lettuce, croutons, parsley and onion. In container with tight-fitting lid, shake vinaigrette ingredients until well mixed. Drizzle over salad; gently toss until evenly coated.