He tends to do it in the morning & evening which makes me think he's yawning!!! I caught him on camera doing it yesterday, it looks funny: -
Emma has documented that "yawn" with a very similar pic like yours (1 or 2 years ago? don't remember the thread subject)
Mine do it very rarely. Tried to catch it on cam years ago, but never succeded, Have not seen them doing it for a long time.
Actually my loaches hardly yawn anymore, they did that occasionally (but rarely display their "tube" like yours).
When my Y.Caudipunctata yawn, their spine flashes. No other fish around, must be just some kind of "anatomic" movement?
If another clown is around it could be body language. I have posted one pic a while ago (don't remember the thread), where the smaller male clown is doing that towards the female alpha clown and it appeared like it was a "ready to fight" message. No fight followed though.
One other option reminds me of some gobies, who move their lips to get rid of sand or other stuff underneath the lip.
I like your pic, their mouth is a very interesting feature.
Wow! That's so cool that you caught that on camera! My little ones do this quite often... not sure why? Just a funny little quirky stretch or something similar to that I imagine.
Thanks for posting here, but I think it should go on that funny loach thread, too!
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