That's a stripey, you can tell by the length of the dorsal if you hold it over the top next to the gill plate. It could be a short nose, bill fish but I sent the pic to a Scientist and he suggested it might be a white striper that has a pigment augmentation. But then, the shape of the jaw is a little too oval. The Blue Marlin has a short and broad lower jaw whereas the Striped Marlin’s lower jaw is narrower and pointed. Oval? Maybe it's a hybrid.