Combine Cajun seasoning, salt, and pepper in a small bowl. Sprinkle fish evenly with spice mixture. Put fish in Zip N' Steam Bag cook for about 9 minutes in the microwave or until fish flakes easily when tested with a fork or until desired degree of doneness.
Combine pineapple and next 5 ingredients (through jalapeño) in a large bowl, stirring gently.
Serve pineapple mixture with fish. Garnish with lime wedges.