ID THIS FISH GAME THREAD

Think people! The first clue is the dorsal fin. What groups of FW fish possess a double dorsal fin?
 
Wrong Death Pony. You're right Alex it's a Goby. Does look alot like a Rainbow doesn't it?
 
mistichthys luzonensis?
 
nope
 
nope
 
I'll give another clue today because upon further study I realize I've committed a slight error. This fish is actually found in brackish and marine environments of the European Atlantic, Mediterranean and Black Seas. Sorry for the confusion.
 
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