Cut the sea bass into small bite sized cubes (about 1/2 inch each) and transfer to a medium sized glass or stainless steel bowl. To the bowl add the orange juice, lime juice and zest, kosher salt and freshly cracked black pepper. Gently stir to combine so all the fish is coated in the citrus juice. Cover and refrigerate for 2-3 hours.
After 2-3 hours the fish should look fully "cooked." This means that each piece of fish no longer looks raw when broken open. If the fish still looks slightly raw, cover and place back into the refrigerator for an additional hour. Drain most of the juice from the fish of the remaining juice and add the olive oil and set aside.
In a clean bowl, toss together the mango, cucumber, avocado, red onion, tomato, jalapeño and chives. Add the sea bass and toss to combine. Taste and season with additional salt, pepper or lime juice as needed. Serve immediately with freshly fried tortilla chips.