Guess what monster fish this is

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Hmmm, why am I getting the feeling this is either one of the rhinogobius species I can't find pictures of?
Just in case how about a Cotylopus species?
 
Hey, those aren't Gobiidae (gobies), they are Eleotridae (sleepers), no wonder I couldn't find it.
 
Lake chub (Couesius plumbeus)?
 
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