A sleek, powerful fish, the marlin is deep blue on the upper half of its body and silvery white underneath. The marlin's body is densely covered with bony scales. It has a long, sharp-pointed bill and a rounded dorsal fin. ... HABITAT: White marlin are found throughout tropical and temperate portions of the Atlantic Ocean.

What kind of scales do Marlins have?

The body is covered with thick, bony, elongated scales that have one, two, or three posterior points, with one being the most common form. The bill is long and stout. Both the jaws and the palatines (the roof of the mouth) are covered with small, file-like teeth.

Why can't you eat a marlin fish?

Because these impressive fish are at the top of the food chain, they can also be loaded with toxins. “Marlin often contains unhealthy levels of mercury and other toxins that may be harmful to humans,” says Appel. Avoid all striped marlin and most blue marlin, with the one exception being blue marlin caught in Hawaii.