Q:

Do fish have eyelids?

A:

Fish do not have eyelids, with the exception of the shark. Eyelids are used to protect the eyes from dust and keep them moist; fish do not have these problems underwater, so there is no need for eyelids.

Although fish do not have eyelids, they can sleep. Some float, while others bury themselves or wedge themselves into tight places. Even though they are sleeping, they are still able to sense danger. Fish sleep for as long as they need, depending on how much energy they have exerted during the day.

Fish also lack eyelashes, as they are unnecessary for survival or comfort.


Is this answer helpful?

Similar Questions

  • Q:

    What is the difference in steelhead trout vs. salmon?

    A:

    Steelhead trout don't necessarily die after they've returned to their native streams to spawn, but with the exception of the Atlantic salmon, salmon almost always do. The steelhead is a rainbow trout and has black spots and a red band down its side. Salmon lack the red band and are silver or dark colored above, with much larger spots along the back, the dorsal fin and the tail.

    Full Answer >
    Filed Under:
  • Q:

    Do fish have lungs?

    A:

    With the exception of the lungfish, fish do not have lungs. They possess gills instead. The lungfish has lesser lungs than other animals and cannot use them to breathe outside of water the way other animals do.

    Full Answer >
    Filed Under:
  • Q:

    How many eggs do fish lay?

    A:

    Fish can lay as few as one egg or as many as 340 million eggs in a season. The amount of eggs varies depending on the fish size and species.

    Full Answer >
    Filed Under:
  • Q:

    What is included in a list of fish without scales?

    A:

    Fish that do not have scales include catfish, sharks, rays, chimaeras, skates, moray eels, sturgeons, paddlefishes, salifin blennies, combtooth blennies, hagfishes and lampreys. Many of these fish have evolved scale alternatives.

    Full Answer >
    Filed Under:

Explore