Fat eyelid
A fatty eyelid is a transparent, immobile lid that is found in some groups of bony fish . It protects the eye and improves its streamlined shape. Only in mullets does it consist of fatty tissue, but not in other fish with fatty eyelids such as herrings , jacks and mackerel . Fatty eyelids can cover the front and back of the eyes, leaving a horizontal, elongated gap, or they can cover the entire eye except for a small opening in the middle.
literature
- Kurt Fiedler: Textbook of Special Zoology. Volume 2: Dietrich Starck (Ed.): Vertebrates. Part 2: fish. Gustav Fischer, Jena 1991, ISBN 3-334-00339-6 , p. 87.