Heat oil in a large nonstick skillet over medium-high heat. Combine Cajun seasoning, salt, and pepper in a small bowl. Sprinkle fish evenly with spice mixture. Add fish to pan, and cook for 2 minutes on each side 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.
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