Season the redfish evenly with Cajun seasoning. Place the fillet on the smoker with the skin side down and cook until the flesh is cooked throughout and flaky, pulling away from the skin around the edges, about 1 hour. Remove the fish from the smoker and allow it to cool.
Pulling the fish off the skin, crumble the fish in your hands, allowing it to flake apart but leaving decent-size chunks of fish. Make sure to feel for and pull out any bones.
Add fish to a large mixing bowl and add in the yogurt, mayo, lemon juice, lime juice, parsley, green onion, yellow onion, and capers. Mix together with a spoon. Taste and add more Cajun seasoning to taste. Serve fish dip immediately with chips or crostini, or refrigerate for later.
Recipe by Louisiana Cookin' at https://louisianacookin.com/smoked-redfish-dip/