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Moderator Ambassador Field Correspondent Lunker
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Moderator Ambassador Field Correspondent Lunker
Joined: Apr 2002
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Since fish do not have eye lids and most do not have an adjustable iris (most with a fixed pupil) they regulate the amount of light entering the eye by moving deeper or shallower. In humans and many other animals the pupil size (opening) is adjusted by the iris (colored part of the eye).
Last edited by Bill Cody; 06/18/17 01:40 PM.
aka Pond Doctor & Dr. Perca Read Pond Boss Magazine - America's Journal of Pond Management
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