 fullness of time these other systems may indeed reveal species that feed on jellyfish," Gibbons says. "Most jellyfish-eating fish are generalist feeders after all, including this species."
And it's likely that the gobies have a few more tricks up their fins: Their relatives in other waters build and defend nests. "To grow and develop, eggs need oxygen, so the males and their nests are unlikely to be on the hypoxic mud," Braithwaite notes. And "how do the young larvae develop their physiological and behavioral adaptations? Are they innate or do they require the fish to learn or be exposed to hypoxic conditions to develop appropriate adaptations?"
Either way, jellyfish beware.