The Black Marlin is considered one of the fastest fish inside the oceans, capable of reaching leading speeds of 68 miles for each hour, accompanied by its near relative, the Sailfish. Fins: One of the distinguishing features of your black marlin is its non-retractable pectoral fins, not like other marlins https://costaricafishingexperts.com/wp-content/uploads/2016/09/LosSuenoFishingMarlin.jpg