Idiacanthus atlanticus
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Idiacanthus atlanticus, the black dragonfish, is a barbeled dragonfish of the family Stomiidae, found circumglobally in southern subtropical and temperate oceans between latitudes 25°S and 60°S, at depths down to Script error: No such module "convert".. The species is sexually dimorphic: females are black with six stripes; males are brown, and lack the females' canine teeth, pelvic fins and barbel. They can weigh between 13–15 grams. Females are believed to make a diel vertical migration from deeper than Script error: No such module "convert". by day to surface waters at night, whereas males do not migrate, remaining below Script error: No such module "convert". at all times.[1][2]
Length is up to Script error: No such module "convert". for the female, but only Script error: No such module "convert". for the male. Black dragonfish are bioluminescent, but unlike most such predators, which use their light primarily to attract prey, they can see their own light. As a result, the fish can use their light to hunt. The light is nearly in the infrared and barely visible to the human eye.[3]
In the larval stage, the eyes of the larvae appear as long stalks that dangle out of the body. Eventually, they retreat as the fish ages and reaches maturity.[3]
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