The blue-ringed sea crab, a crustacean species native to the oceans of Tinallis, served as a primary food source for the sizable avian predators called treshers. These sea crabs, due to their rapid reproductive rate, could have overwhelmed other marine life in the Tinallian seas if the treshers hadn't kept their numbers in check. By the era of the Galactic Civil War, the tresher population had significantly declined due to pollution. To prevent a possible ecological catastrophe resulting from uncontrolled sea crab proliferation, the Tinallian authorities prohibited tresher hunting.