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The Bizarre Spookfish

I saw the name I just had to find out what a spookfish was. This is a ghostly-looking fish that makes its home in deep waters. It has the most bizarre eye structure where each eye has a lateral swelling known as a diverticulum that is separated from the main eye by a septum. The main part of its eyes functions like the eyes of most animals but the diverticulum part has a curved, composite mirror that consists of many layers of guanine crystals. 

This part can gather light more than a regular eye and when reflecting light the result is that the fish can see both up and down at the same time. Sort of like a mirror reflection. The spookfish supposedly is the one vertebrae to have this mirror eye structure. The spookfish spend their time in a depth of 1 –2,000 meters so they are rarely seen. They feed on small crustaceans and plankton. 

  • Question of

    Funny looking fish isn’t it?

    • Yes
    • No
  • Question of

    Have you ever seen one in an aquarium?

    • Yes
    • No

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