Heat the salad dressing in a large skillet over medium-high heat.
Combine sugar and cumin and sprinkle 2 tablespoons of this mixture over the fish. Place fish in the skillet, sugar side down; sprinkle with remaining sugar mixture.
Cook fish for 3 to 5 minutes per side or until it flakes easily when tested with a fork. Remove from skillet; cover and keep warm.
Add lime and orange juices to skillet; cook over medium heat until heated through, stirring occasionally. Remove from heat and stir in cilantro and mint; spoon evenly over fish.