Corvus wrote:The layer which makes blue eyes has several functions: it filters ultraviolet light and it improves contrast and makes it easier to see in changing light. Many fish do have this, but it's most obvious on puffers and diodontids due to their large eyes.
Corvus wrote:You often read that, but they are active throughout other times, too. In my impression mostly in the morning and evening, but you can also see them at night and during day.
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