Black Marlin

The black marlin is the only marlin with non-retractable fins. Another distinguishing trait is their dorsal fin which is proportionately the lowest of any billfish. It stands less than 50 percent of the fish's body height. The black marlin's back is slate blue and transitions to a silver belly. It may also have light blue stripes when excited.

Description
The Black Marlin is a fast agile fish with a long pointed nose which grows every time it lies.