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Cleaner shrimp

life science Maturity 11-13 Next article →

Cleaner shrimp are specialized decapod crustaceans that provide essential services to other marine organisms. They are best known for participating in a cleaning symbiosis. This is a biological relationship where two different species interact to benefit one another. In this specific case, the shrimp act as cleaners for various client fish. This interaction is vital for the health of the coral reef ecosystem. Many people keep these shrimp in saltwater aquaria because of their colorful looks. They also enjoy watching the helpful work these shrimp perform for fish.

Lysmata amboinensis cleans mouth of a Moray eel
Lysmata amboinensis cleans mouth of a Moray eel

The mechanism of cleaning symbiosis relies on a direct exchange of resources. The shrimp search for parasites living on the bodies of client fish. By eating these parasites, the shrimp gain important nutritional value. The fish receive the benefit of having harmful pests removed from their skin and gills. Beyond just eating parasites, the shrimp also consume mucus from the wounds of injured fish. This process helps reduce the risk of infections for the injured animal. Removing this material also assists the healing process for the fish. Ultimately, this cleansing service helps to lower the stress levels of the client fish.

Wipe Coral Shrimp
Wipe Coral Shrimp

There are several different families of shrimp that include cleaner species. Most cleaner shrimp belong to the Hippolytidae family, such as the Pacific cleaner shrimp, Lysmata amboinensis. Another common group is the Palaemonidae family, which includes the spotted Periclimenes magnificus. Other families like Alpheidae, Pandalidae, and Stenopodidae also contain cleaner species. For example, the banded coral shrimp, Stenopus hispidus, belongs to the Stenopodidae family. While many shrimp are social cleaners, others follow different lifestyles. The genus Urocaridella contains shrimp that are often cryptic. These shrimp may live in caves and are not usually associated with other animals.

Periclimenes magnificus
Periclimenes magnificus

On many coral reefs, these shrimp gather at specific locations called cleaning stations. At these stations, shrimp often work alongside cleaner fish like the cleaner wrasse. These groups of cleaners create a busy hub of activity for passing fish. Large numbers of shrimp can live in close proximity at a single station. Researchers have observed up to 25 shrimp living together in these small areas. This high density of cleaners makes the stations very important for the local fish population. The presence of both fish and shrimp cleaners allows for a highly efficient cleaning service.

Lysmata amboinensis cleans mouth of a Moray eel
Lysmata amboinensis cleans mouth of a Moray eel

Scientists have conducted detailed studies to understand how effective these shrimp really are. A study published in the journal Marine Biology in August 2018 provided significant evidence. The researchers, including Vaughan, Grutter, Ferguson, Jones, and Hutson, examined how shrimp interact with fish. Their findings showed that cleaner shrimp are "true cleaners" of injured fish. They confirmed that the shrimp's actions directly aid in the healing of wounds. This research highlights the biological importance of the shrimp's role in reef health. It shows that their cleaning behavior is more than just a simple habit.

Periclimenes magnificus
Periclimenes magnificus

Shrimp use specific behaviors to communicate with potential clients. When a fish swims near a cleaning station, the shrimp may perform a "rocking dance." This dance consists of a side-to-side movement to attract attention. The frequency of this rocking motion is tied to the shrimp's hunger levels. When shrimp are hungry, they perform the dance more often. This suggests that there is competition among the shrimp for food. Sated shrimp, or those that are full, do not rock as frequently as their hungry neighbors.

Wipe Coral Shrimp
Wipe Coral Shrimp

To survive in a competitive environment, some shrimp have developed unique schedules. The species Urocaridella antonbruunii has a very interesting way of working. This shrimp was observed cleaning fish while they were sleeping at night. By working at night, the shrimp can avoid competition with other cleaners during the day. This allows them to find food without fighting for the same clients. This behavior shows how different species adapt to find their own way to survive. It is a clever way to manage the challenges of life on the reef.

Wipe Coral Shrimp
Wipe Coral Shrimp
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File:Lysmata amboinensis cleans mouth of a Moray eel.jpg
Lysmata amboinensis cleans mouth of a...
File:Periclimenes magnificus.JPG
Periclimenes magnificus.JPG
File:Wipe Coral Shrimp.jpg
Wipe Coral Shrimp.jpg
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