Blackened Fish Tacos

Name: Blackened Fish Tacos
Ingredients: 2 medium navel oranges; ⅓ cup chopped white onion; ¼ cup chopped fresh cilantro, plus more for garnish; 1 medium red Fresno chile pepper, sliced very thinly; ⅛ teaspoon salt; 2 tablespoons lime juice, divided; 1 pound skinless snapper fillets; 2 tablespoons Cajun blackened seasoning; 1 tablespoon canola oil; 1 cup shredded red cabbage; 8 (6-inch) corn tortillas, warmed