Fish Tacos With Tropical Salsa

2 cup chopped tropical fruit, such as kiwi fruit, pineapple, mango, and/or papaya 2 avocados, halved, pitted, peeled and chopped ¼ cup chopped fresh cilantro ¼ cup finely chopped red onion 1 fresh serrano or jalapeño pepper, seeded and finely chopped 2 tablespoon fresh lime juice