Catfish With Southwestern Relish

Name: Catfish With Southwestern Relish
Ingredients: 4 catfish fillets, 1/2 in. thickness; 1 (15 ounce) can black beans, drained; 1 medium ripe avocado, diced; 1 medium tomatoes, diced; 2 tablespoons thinly sliced scallions; 1 teaspoon lime peel; 3 tablespoons lime juice; 1 tablespoon chopped fresh cilantro; 1 tablespoon chopped fresh oregano; 1 tablespoon olive oil; 1⁄4 teaspoon salt; 1⁄4 teaspoon cayenne pepper; 1⁄2 teaspoon olive oil (for grill pan); lime wedge (garnish); cilantro, sprigs (garnish)