Marlin, sailfish, swordfish and spearfish dominate the seas as a top predator, but their pursuit and harvest by humans puts them under threat.
They are distinguished by their elongated nasal bones which form the 'bill'.
Armed and in danger
Swordfish and other billfish are hunted for food and for sport. The indiscriminate methods used to catch them also puts additional pressure on other vulnerable and endangered species such as marine turtles and tuna.
