Otoro is the fattiest portion of the tuna, found on the very underside of the fish.Bluefin tuna are beautiful, large, and powerful swimmers with dark red meat that is rich and buttery. Given its popularity with sushi chefs and restaurants, bluefin tuna have been in the media for overfishing concerns. The bluefin that H&H sources is caught sustainably using the rod and reel method, meaning that fish are caught one by one and with zero bycatch. The catch is minimal and supports local California fishermen. Enjoy this specialty, guilt-free!