01 - In a large bowl, combine green and red cabbage, carrot, and cilantro. In a small bowl, whisk together mayonnaise, lime juice, salt, and pepper. Pour over the vegetables and toss well. Refrigerate until ready to use.
02 - In a small bowl, mix sour cream, mayonnaise, lime juice, garlic powder, and salt until smooth. Set aside.
03 - Pat fish fillets dry. In a medium bowl, whisk flour, baking powder, salt, pepper, and paprika. In another bowl, beat egg with sparkling water. Pour wet ingredients into dry and whisk until just combined.
04 - Heat 1 inch oil in a deep skillet over medium-high heat to 350°F. Dip fish strips into the batter, letting excess drip off, then carefully lower into hot oil. Fry in batches for 3-4 minutes, turning once, until golden and crispy. Drain on paper towels.
05 - Place crispy fish in tortillas. Top with cabbage slaw and drizzle with crema. Garnish with cilantro and serve with lime wedges.