Wrasse

Wrasses are many kinds of fish.

Most are small and bright. Some can grow very large.

These fish eat small sea animals. Some use rocks like tools. They smash shells on rocks to eat.

Some wrasses are helpers. They clean other fish. They eat tiny pests off the big fish.

Many wrasses can change their sex. A female can become a male. This helps them live in groups.

They live in warm ocean waters. You can see them on coral reefs.

Wrasses are a large family of colorful ocean fish.

There are over 600 different species. Most are small, but the humphead wrasse can grow very big.

These fish are carnivores, which means they eat meat. They mostly eat small sea animals. Some wrasses are very smart. They use rocks as tools. They smash hard shells on rocks to reach the food inside.

Some wrasses act like helpers. They work at cleaning stations on coral reefs.

The cleaner wrasse eats tiny pests off larger fish. This helps the bigger fish stay healthy.

Many wrasses can also change their sex. Most start as females. The largest fish can become males. This helps them live in groups. Some species are born as one sex and stay that way. Others can change based on their needs. Wrasses live in warm waters, but some live in cooler areas like Norway.

Wrasses are a huge and colorful family of marine fish. They belong to a group called Labridae. There are more than 600 different species in this family. Most of these fish are quite small. However, the humphead wrasse can grow to be very large.

Many species are famous for having bright colors. They often live in shallow waters like coral reefs. Some also live near rocky shores. Even a few live in cooler waters like Norway.

These fish are carnivores that eat small invertebrates. Some wrasses are very clever hunters. They use rocks or hard coral as tools. They call these rocks "anvils." The fish smash hard prey like clams or crabs against the anvil to open them.

Other wrasses act as helpers in the ocean. The bluestreak cleaner wrasse works at cleaning stations. They eat tiny parasites off much larger fish. This is a helpful partnership for both sides.

Scientists have studied wrasses for a long time. We know about fossil wrasses from the Early Eocene period. These fossils were found in Monte Bolca, Italy.

Some fossils were even found in Antarctica. These fish lived there before the continent became too cold. Researchers also study how their jaws work. Their mouths can move out very quickly to grab food. This special jaw structure is called a four-bar linkage. It helps them bite with great force.

There are many different types of wrasses. The family includes many groups called genera. One group is called Scarinae, which includes parrotfish. Another group is called Hypsigenyini, which includes odacine wrasses. Some wrasses, like the tautog, are important to people. Indigenous humans in the Western Atlantic used them for food. Today, many people keep wrasses in home aquariums. They are even used on salmon farms to help clean sea lice.

One of the most amazing things about wrasses is how they grow. Many species can change their sex. This is called being a protogynous hermaphrodite. This means a fish can start as a female and become a male. Usually, the largest female in a group changes into a male. This helps the fish manage their mating groups. Some species are different and stay the same sex their whole lives. This allows them to live in many different ways in the sea.

The wrasses are a massive and diverse family of marine fish known scientifically as Labridae. This family contains over 600 different species organized into 81 genera. These fish are found in many different environments across the globe. Most inhabit the tropical and subtropical waters of the Atlantic, Indian, and Pacific Oceans. However, some species can handle cooler temperatures. For example, the Ballan wrasse lives as far north as Norway.

While most wrasses are quite small, they show incredible variety in size and appearance.

One of the most fascinating aspects of wrasse biology is their complex jaw structure. Scientists study them to understand fish-feeding biomechanics. Their mouths are protractile, meaning they can extend outward. This movement is possible because of a mechanical system called a "four-bar linkage." In this system, the nasal and mandibular bones connect to the rigid neurocranium. The maxilla bones then join to the tips of these bones. This creates a loop of four rigid bones held by moving joints. This setup allows them to achieve fast protrusion or a very forceful bite.

Many wrasses exhibit unusual reproductive behaviors and developmental systems. Many species are protogynous hermaphrodites, which means they can change sex from female to male. This usually happens within a haremic mating system. In these groups, juveniles are often "initial-phase" individuals of mixed sexes. As they grow, the largest adults become "terminal-phase" males that hold territory. While sex change is generally female-to-male, experiments show it can go the other way. If two male bluestreak cleaner wrasses are placed together, the smaller one can become female again.

There are several different ways wrasses handle reproduction and care. Some species use broadcast spawning, where they release many planktonic eggs into tidal currents. In these cases, the adults do not interact with their offspring. However, the subfamily Labrinae is different. This group includes genera like Symphodus, Centrolabrus, and Labrus. These fish exhibit broodcare behavior, which is a form of parental care. Males in these species may build nests out of algae or crude cavities. They will also ventilate the eggs and defend the nests from predators. Without this parental care, the eggs would not survive.

Taxonomy, or the way we classify these fish, has changed over time. For a long time, parrotfish were considered their own family called Scaridae. Scientists now recognize them as a subfamily, Scarinae, within the wrasse family. Similarly, odacine wrasses were once thought to be a separate family. We now know they are nested within the wrasse tribe Hypsigenyini. They are most closely related to tuskfishes. The family is divided into eight subfamilies, including Hypsigenyinae, Cirrhilabrinae, and Labrinae.

Some wrasses are incredibly intelligent and use tools to eat. Twenty-one species across eight different genera have been seen using "anvils." They use large rocks or hard coral to smash open hard-shelled prey. This includes animals like clams, crabs, and sea urchins. In one surprising instance, a blue tuskfish was observed smashing a young green sea turtle on an anvil.

Other wrasses, like the bluestreak cleaner wrasse, participate in a cleaning symbiosis. They act as cleaners at "cleaning stations" on coral reefs. They eat parasites, dead tissue, and scales off larger "client" fish. This relationship helps the client stay healthy and provides the wrasse with food.

We can learn about the history of these fish through fossils. Fossil wrasses have been found dating back to the Early Eocene in Monte Bolca, Italy. One fossil genus, Phyllopharyngodon, belongs to the Hypsigenyinae subfamily. Wrasses also had a very wide distribution in the prehistoric past. Fossil remains have been discovered in the La Meseta Formation of Antarctica. These fish likely disappeared from Antarctica when the continent cooled during the Oligocene.

Humans have many connections to the wrasse family. In the Western Atlantic, indigenous people used the tautog as a common food source. Today, wrasses are popular in both home and public aquariums. They are also very useful in modern industry. In Scotland, cleaner wrasses are used in commercial salmon farming. They act as "lice busters" by eating sea lice that infest the salmon. This provides a significant commercial benefit to fish farmers.