Dartfish

Dartfishes are a subfamily, Ptereleotrinae, of goby-like fishes in the family Microdesmidae of the order Perciformes. They are saltwater fish.{Fact|date=May 2008} The dartfishes were briefly raised to family status, but have now been re-incorporated into the family Microdesmidae as a subfamily. ...
Found on http://en.wikipedia.org/wiki/Dartfish
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