1 yellow zucchini or yellow squash
Kosher salt
2 tomatoes, diced
1/2 red onion, finely chopped
1/2 jalapeno pepper, minced (remove seeds for less heat)
Juice of 2 limes
2/3 cup packed fresh cilantro (leaves and tender stems), chopped
1 1/2 teaspoons ground cumin
1 1/2 teaspoons ground coriander
8 skinless mahi mahi or striped bass fillets (about 6 ounces each)
Extra-virgin olive oil, for brushing
Freshly ground pepper