The blue marlin is a fearsome predator, and its habitat is the open ocean. It can grow to be over 15 feet long, but it typically weighs between 550 and 1,200 pounds. The average water temperature where blue marlins are found is around 80 degrees Fahrenheit.
Blue marlins are highly adaptable fish that live in all temperate oceans of the world. They are able to survive in a wide range of temperatures and depths because they have a high degree of fusibility (the ability to adjust their body temperature). Blue marlins have been known to be aggressive at times, but most of the time they are fairly docile creatures.