Blackened Catfish Tacos

Name: Blackened Catfish Tacos
Ingredients: 1/4 cup mayonnaise; 1 tablespoon freshly squeezed lime juice; 1 teaspoon balsamic vinegar; 1 teaspoon sugar; 1/4 head red cabbage, thinly sliced; 1/4 head green cabbage, thinly sliced; 4 yellow corn tortillas; Two 8-ounce skinless American catfish fillets, split lengthwise down the center; 1/4 cup Creole seasoning; 1/2 cup peanut or canola oil; 1/2 small red onion, halved and thinly sliced; 1 avocado, cut into 8 slices; 1/4 cup store-bought thousand island dressing; 1/4 cup fresh cilantro leaves, for garnish, optional