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Marinate fish fillets in the refrigerator for 1-2 hours, longer if desired. While they are marinating, prepare the salsa.
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In a large bowl, combine the black beans, mangoes, red onion, and cilantro.
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In a small bowl, whisk the lime juice, vinegar, sugar, garlic powder, salt, and pepper until the sugar is dissolved. Pour mixture over black beans and mangoes. Cover and chill in the refrigerator for at least an hour.
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When the fish is done marinating, warm the grill pan to medium high heat & spray with coconut oil cooking spray. Grill the fish about 6 minutes on each side for a 1-inch steak, or until firm.
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When ready to serve, gently fold the avocado into the mango salsa. Season with additional salt and pepper to taste. Top each fillet with salsa and enjoy!