description California Headlightfish Overview
The California headlightfish, Diaphus theta, is a lanternfish found in the North Pacific, including waters off western North America. Like other members of the family Myctophidae, it has light-producing organs called photophores arranged in species-specific patterns, including prominent luminous structures near the head. It occupies mesopelagic waters and participates in diel vertical migration, moving toward shallower depths at night to feed and returning deeper during daylight.
help California Headlightfish FAQ
Why is the California headlightfish called a 'headlightfish'?
Like other species in the lanternfish genus Diaphus, it has prominent light-producing organs on its head resembling headlights. These sit alongside rows of photophores along its body that give lanternfishes their name.
Where is the California headlightfish found?
Diaphus theta lives in the North Pacific, including waters off western North America from California northward. It is part of the Myctophidae family, one of the most abundant fish families in the open ocean.
Does the California headlightfish migrate vertically?
Yes, like most lanternfish it performs diel vertical migration, spending daylight hours at depth and rising toward the surface at night to feed. This daily migration is one of the largest animal movements on Earth in aggregate.
What does the California headlightfish eat?
It feeds on small planktonic prey, mainly crustaceans such as copepods and euphausiids. It in turn serves as prey for larger fish, squid, and marine mammals.
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