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What specie of hypostomus is? He was captured in the Parana River...

It's very hard to tell when it is exhibiting stress coloration.

Some pictures of the same fish....

Clearly a Hypostomus species but its still a juvenile. And Hypostomus is such a vast "ocean" to swim through it may take a while to figure it out. You may want to post a few pics of the ventral side of the fish so we can see the mouth, etc. And you may have to wait until its a little older. I'll wait for others, much more experienced than I, to weigh in.

Here a picture of the mouth...

One more video...

http://www.youtube.com/watch?v=S9_FhD-z ... e=youtu.be[/youtube]