- Combine sweet & sour sauce, brown sugar, soy sauce and 1/4 cup water.
- Heat oil in large saucepan or skillet over high heat. Add celery, carrot, onion, garlic and ginger; stir-fry 1 minute.
- Add zucchini; stir-fry 1 minute longer. Remove vegetables.
- Cut fish into 2-inch pieces and place in single layer in same pan.
- Pour sweet & sour sauce mixture over fish; bring to boil. Reduce heat; simmer, covered, 4 minutes.
- Turn fish over; simmer 4 minutes longer, or until fish flakes easily with fork.
- Gently stir in vegetables and heat through. Serve immediately.