Glomer fish have special adaptations for survival in the dark. For example, deep-sea anglers, he has an electric flashlight on his head, at a depth of 7 km (at such a depth they are found) there is nothing to see and he also cannot see fish in the distance, and so the fish swims into the light and he grabs it, and at the same time and illuminates the path. There are many more such structural oddities in ball-water fish.
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