1Heat a large skillet over medium-high heat. Sprinkle both sides of the fish evenly with 1/4 teaspoon salt and pepper. Add canola oil to the pan; swirl to coat. Add fish to the pan; saute 4 minutes or until golden. Turn the fish over; saute 2 minutes or until the desired degree of doneness.
2Combine the radishes and the next 3 ingredients (through serrano) in a small bowl. Combine remaining 1/4 teaspoon salt, olive oil, juice, and honey in a small bowl, stirring with a whisk.
3Drizzle dressing over the peach mixture; toss gently. Serve relish with fish.