Swordfish

The swordfish (Xiphias gladius), also known as the broadbill in some countries, is a large and fascinating fish known for its long, flat, sword-like bill. It is one of the most famous predatory fish and is the only member of the family Xiphiidae. Because of its impressive size and fighting spirit, it is a popular choice among sport fishers and belongs to the billfish group.

These amazing fish have elongated bodies and lose their teeth and scales as they grow up. Swordfish live in many parts of the world, including tropical and temperate areas of the Atlantic, Pacific, and Indian Oceans. They can usually be found close to the surface, but sometimes they dive as deep as 2,878 meters (9,442 feet)!

On average, swordfish are about 3 meters (10 feet) long, but the largest ones can reach up to 4.55 meters (14 feet 11 inches) and weigh as much as 650 kilograms (1,430 pounds). Their unique shape and powerful presence make them one of the most respected creatures in the ocean.

Taxonomy and etymology

The swordfish is named after its long, pointed bill that looks like a sword. Its scientific name, Xiphias gladius, comes from Greek words meaning “swordfish” and Latin meaning “sword”. Though it looks similar to other fish like marlin, it is actually different and belongs to its own family.

Scientists believe swordfish evolved separately from other similar fish a very long time ago. Some old fossils once thought to be swordfish are now known to be from a different group. The oldest confirmed swordfish fossils are from a few million years ago, found in places like Italy and North Carolina.

Description

Swordfish are large fish with a long, flat, pointed bill on their heads. They can commonly grow up to 3 meters (10 feet) long, but some have been found to be as long as 4.55 meters (about 15 feet). The biggest swordfish ever caught weighed 682 kilograms (1,500 pounds). Females are usually bigger than males.

These fish become adults around 4 to 5 years old and can live for at least 9 years. Scientists figure out their age by looking at rings on their fins.

Swordfish are cold-blooded, but they have special parts near their eyes called heater cells. These cells warm their eyes and brains, making their vision better in cooler water. This helps them see better when hunting for food.

Behavior and ecology

Swordfish are known for their long, flat noses, but scientists think they mostly use them to hit prey and make them weaker, not to stab them. They are very fast swimmers and can catch their food this way. They usually swim alone and like to rest near the water's surface. Sometimes they jump out of the water, maybe to shake off small creatures that stick to them.

Swordfish like warm water but can live in many different temperatures. They eat small fish, squid, and other sea animals, using their noses to hit bigger food. Big swordfish don’t have many natural enemies, but sometimes larger sharks or whales might chase them. Smaller swordfish are eaten by many other fish. People also catch swordfish a lot for food.

Females can lay millions of eggs, and the baby fish grow quickly with their noses appearing early on.

Fisheries

Swordfish have been caught for a long time using different ways, like using a harpoon. Today, many people catch them with a method called long-line fishing. In places like the Strait of Messina, people still use old wooden boats named feluccas to catch them, and they are a special part of the food there.

Swordfish are strong and fight hard when caught. Even though they don't attack people without reason, they can be risky when caught with a harpoon. Sometimes, they have hurt small boats by hitting them with their swords.

Recreational fishing

Recreational fishing has developed a special way to catch swordfish. Because rules stopped some fishing methods near the shore, swordfish numbers are getting better.

People catch swordfish in different ways, but the most common is called deep-drop fishing. Swordfish like to stay deep during the day, so fishing tools need to be strong because these fish can get very big. Fishermen often use special lights on their baits to help catch swordfish.

As food

See also: Mercury in fish

Swordfish are a type of oily fish, but there are warnings about possible harm from a natural material called methylmercury that can be found in them. Because of this, some groups, like young children and certain women, are advised to avoid eating swordfish.

Swordfish meat is popular for cooking because it is firm and can be cooked in many ways, such as grilling. The color of the meat can vary depending on what the fish eats. In some places, swordfish with orange-colored meat is sold for a higher price.

Conservation status

In 1998, groups like the U.S. Natural Resources Defense Council and SeaWeb started a big campaign to help protect swordfish. They said that too many people were eating swordfish, which was hurting the fish's numbers. Many famous chefs, stores, and people stopped buying and eating swordfish from the North Atlantic Ocean because of this campaign.

Because of these efforts, the U.S. government made a plan to protect swordfish. The leader at the time, Bill Clinton, even asked that people stop selling and bringing in swordfish from certain areas. Now, the swordfish in the North Atlantic are doing much better. However, scientists still don’t know enough about swordfish in other parts of the world, like the Pacific and Atlantic Oceans, and they worry that some groups of swordfish might still be in trouble.

Relationship with humans

Notable incidents

We will skip stories about people getting hurt by swordfish because they are not suitable for young readers.

In culture

People have used the name "swordfish" for fun, like calling a group of stars in the sky Dorado. It was also used as a secret word in an old movie from 1932 called Horse Feathers with the Marx Brothers. Since then, it has been used in many other movies, TV shows, books, and video games.