The black marlin is a large species of fish found in tropical and subtropical waters of the Indian Ocean and Pacific Ocean. Known for its impressive speed and strength, it can reach lengths of up to 15 feet and weigh over 1,500 pounds. The black marlin is easily recognized by its elongated body, sharp bill, and dark blue to black coloration. This fish is a popular target for sport fishing due to its fighting ability and acrobatic jumps when hooked. Black marlins primarily feed on smaller fish, such as tuna and sardines, using their speed and agility to catch prey.