1.In A Small Bowl, Combine Cucumber And Radishes. In Another Small Bowl, Whisk The Vinegar, Oil, 1/4 Teaspoon Salt, 1/8 Teaspoon Pepper And Sugar. Pour Over Cucumber Mixture; Toss To Coat Evenly. Combine Paprika And Remaining Salt And Pepper; Sprinkle Over Fillets. 2.In A Large Nonstick Skillet Coated With Nonstick Cooking Spray, Melt Butter. Add Fish; Cook For 3-4 Minutes On Each Side Or Until Fish Flakes Easily With A Fork. Serve With Cucumber Relish.