GRE Reading Comprehension: Maggoosh-GRE阅读Maggoosh - 15W0YE5E41U4RFZ2N

The Indonesian striated frogfish, a fish that inhabits the benthic zone, or the deepest part of the ocean, hunts by using an esca, a fleshy protuberance, sprouting from its head, that functions as a light. When the striated frogfish hunts rapidly moving prey, its light tends to steadily dim. If it cannot quickly catch such prey, it suddenly stops. One hypothesis is that the striated frogfish can no longer detect the prey because the light from its esca has become too faint. A competing theory is that it has become too exhausted and simply has the energy to neither move nor supply the esca with illumination.