hillstream loach and eyelid

[hmoobthor]

so i watch a video of my hillstream loach that i record of and so has others...

I was told that they can see it blink...which i can confirm it did indeed in my tank and video..

its not like a roll of the eye like other fish...

it litteral blink as in human blink...i can see the eye struction and all close ...and i ask around.

So can anyone shine light on this...i really want to know if some species can do this?

[Jim Powers]

They have no eyelids so they can't blink. However, hillstreams often move their eyes in a manner that looks like a blink. I'm not sure what the purpose of that is, but if you watch the fish for a bit you will see it.

[hmoobthor]

thanks...interesting...

so it was just the effect of the eye being roll around huh...

[Jim Powers]

Yes. They tend to twitch their eyes in a way that looks like blinking.