Make the tartar sauce first. Combine all ingredients together in a bowl. Mix well. Cover and refrigerate until ready to use.
Combine flour and blackened seasoning together in a bowl. In another bowl whisk together milk and egg. In another bowl combine panko bread crumbs and garlic powder. Dredge fish into seasoned flour, dip into egg/milk mixture and then press into panko to coat completely. Repeat until all fish is coated.
Preheat oven to 200 degrees.
Heat oil in a skillet over medium heat. Cook fish, in batches, 2 - 3 minutes on each side or until golden brown and cooked through. Transfer to a paper towel lined plate, sprinkle with salt and keep in warmed oven until all fish is cooked.
Once all fish is cooked serve hot with tartar sauce and a lemon wedge.