Sawfish

The sawfish is a very big fish.

It has a long nose. This nose looks like a saw. It has sharp teeth on its nose.

The fish uses its saw to catch food. It can live in salt water or fresh water. Some sawfish live in rivers and lakes. These fish are hard to find now. They are in danger of disappearing. We must help them stay safe.

Do you like big fish?

The sawfish is a very large ray.

It has a long, flat nose called a rostrum. This rostrum looks like a saw. It has sharp teeth on both sides.

These teeth are not like mouth teeth. They are hard parts of the skin. The sawfish uses this tool to find and catch food.

Sawfish live in many warm waters. They stay in the ocean or in rivers. Some live in lakes too.

There are five living species of sawfish. Some are very big. The largetooth sawfish can grow to 7 meters long. It can weigh 350 kilograms. Other types, like the dwarf sawfish, are smaller.

All sawfish are in big trouble. They are called critically endangered. This means they might disappear forever.

People hunt them for their fins and teeth. They also lose the places where they live. In the United States, the smalltooth sawfish is protected. In Australia, they are protected too. We must help these big fish stay safe.

The sawfish is a very large ray found in warm waters.

These fish live in the ocean, in river estuaries, and even in freshwater lakes. They are famous for their long, flat nose called a rostrum. This rostrum looks just like a saw because it has sharp teeth on both sides.

While they look like sharks, they are actually rays. They have a strong body and a flat underside. Some species can grow to be huge.

For example, the largetooth sawfish can reach 7 meters in length. Large individuals might weigh as much as 350 kilograms or more.

The sawfish uses its rostrum as a special tool to eat.

It uses the saw to find and capture fish and other small living things. The teeth on the saw are not like the teeth in its mouth. These rostral teeth are actually modified parts of the skin. They grow larger as the sawfish gets older. If a sawfish loses a tooth on its saw, it does not grow a new one. The mouth itself has many small, blunt teeth arranged in rows. These teeth look a bit like a cobblestone road on the bottom of the head.

Scientists have studied these fish for a very long time.

People have hunted sawfish for thousands of years. Many different cultures around the world use them in spiritual stories and myths. In the past, people thought there were many different kinds of sawfish. This made the science very confusing for a long time. However, in 2013, experts firmly decided there are only five living species. These include the narrow sawfish and the smalltooth sawfish.

They also belong to two different groups called genera.

Today, sawfish face a very hard job of staying alive.

All five species are listed as critically endangered. This means they are at high risk of disappearing forever. People hunt them for their fins to make soup. They also hunt them for teeth and saws used in traditional medicine. Sawfish also lose the places where they live and grow. Because of this, they are protected in places like Australia and the United States. In these places, people can be fined for hurting them. Since 2007, international rules have also restricted the trade of sawfish.

You can think of a sawfish as a specialized hunter of the sea.

Just as a person might use a tool to reach something, the sawfish uses its nose. It is a very different way to live compared to most other fish. Their bodies are built for life on the bottom of the water. They do not have a swim bladder to help them float. Instead, they use a large, oil-rich liver to stay balanced. This helps them move through the water while they look for food. They are truly unique creatures of the tropical world.

Sawfish, also known as carpenter sharks, are massive fish belonging to the ray superorder Batoidea.

They are defined by a unique, elongated nose extension called a rostrum. This rostrum acts like a biological tool for hunting. It is a flattened extension of the chondrocranium, which is the cartilaginous skull. The rostrum is lined with sharp, transverse teeth on both sides. These rostral teeth are not traditional teeth. Instead, they are modified dermal denticles, which are small structures from the skin.

This specialized anatomy makes them vital components of tropical and subtropical marine ecosystems.

The sawfish uses its rostrum to detect and capture prey.

It hunts for fish and various invertebrates. The saw-like nose allows the fish to strike at prey in the water. While they are generally harmless to humans, they can cause serious injuries if they use the saw while being captured or defending themselves. Inside the body, the sawfish has a unique digestive system. Their small intestines contain a spiral valve. This is an internal partition shaped like a corkscrew. The valve increases the surface area available for absorbing nutrients from food. Because they are elasmobranchs, they lack a swim bladder. To control their buoyancy, they use a large, oil-rich liver.

There are currently five living species of sawfish, divided into two genera.

The genus Anoxypristis contains one species: the narrow sawfish. In the genus Pristis, there are four species. These are divided into the smalltooth group and the largetooth group. The smalltooth group includes the dwarf sawfish, the smalltooth sawfish, and the green sawfish. The largetooth group contains only the largetooth sawfish.

Scientists used to find the taxonomy of these fish very chaotic. However, a major study in 2013 established the current species classifications. This study showed that some previously named species were actually the same. For example, P. microdon and P. perotteti are now considered junior synonyms of P. pristis.

History shows that sawfish have been part of human culture for thousands of years.

They play important spiritual and mythological roles in many global societies. The fossil record also tells a long story. Indisputable sawfish genera appeared in the Cenozoic age about 60 million years ago. This was shortly after the Cretaceous–Paleogene mass extinction. Some extinct species, like those in the order Sclerorhynchoidei, also had long rostrums. These ancient creatures are sometimes called "sawskates" because they are more closely related to skates than to modern sawfish.

Sawfish are among the largest fish in the world.

The smalltooth, largetooth, and green sawfish can all reach lengths of about 7 meters. Some large individuals may weigh as much as 350 kilograms. The dwarf sawfish and narrow sawfish are much smaller. The dwarf sawfish has a maximum length of at least 2 meters. The narrow sawfish reaches at least 1.5 meters. These size differences are important for identifying species in the wild.

Unfortunately, all five species are now critically endangered. They have experienced a drastic decline in recent decades. One major cause is hunting for their fins to make shark fin soup. People also use their teeth and rostrums for traditional medicine. Habitat loss also threatens their survival. Currently, the only remaining strongholds for sawfish are in Florida, United States, and Northern Australia. Because of these threats, the Convention on International Trade in Endangered Species (CITES) has restricted their trade since 2007.

Understanding sawfish requires distinguishing them from similar-looking animals.

They are often confused with sawsharks, which belong to the order Pristiophoriformes. You can tell them apart by their gill slits. Sawfish have five gill slits on the underside of the body. Sawsharks have gill slits on the side of the neck. Sawsharks also have long barbels on their rostrum, which sawfish lack. Additionally, sawfish should not be confused with swordfish, which have a very different body shape. Protecting these unique rays is essential for maintaining the health of coastal and freshwater environments.