Quillfish: Ancient Fish with a Bioluminescent Glow

Quillfish (also known as Fangfish or Quillback) are a species of deep-sea fish that belong to the family Osteobranchidae. They are found in the oceans around the world, typically at depths of 200 to 1,000 meters (660 to 3,300 feet).

Quillfish have a distinctive appearance, with long, needle-like teeth and a body covered in quill-like scales. They can grow up to 30 centimeters (12 inches) in length and are known for their ability to produce bioluminescent light.

Quillfish are thought to be one of the most primitive species of fish still alive today, with features that are similar to those of ancient fish that lived over 300 million years ago. They are also important components of the deep-sea ecosystem, serving as both predators and prey for other deep-sea animals.