Fish Tacos With Watermelon Salsa

Name: Fish Tacos With Watermelon Salsa
Ingredients: 4 cups diced seedless watermelon; 1/2 small red onion, finely diced; 1/2 cup roughly chopped fresh cilantro; Juice of 2 limes, plus lime wedges for serving; 1 jalapeno pepper, seeded and finely diced; 1 tablespoon plus 2 teaspoons extra-virgin olive oil, plus more for brushing; Kosher salt; 1 pound skinless wild striped bass fillets; 1 teaspoon chipotle chile powder; 1 romaine lettuce heart, thinly sliced; 8 corn tortillas; 1 avocado, sliced