|Mudskippers in The Gambia|
Mudskippers are a type of fish. They are part of a fish family known as tribe Periophthalmini), which is in the family, or type of, Gobiidae (Gobies). They are amphibious fish, which means that they can use their pectoral fins to "walk" on land. Because they are amphibious, they are, unlike most fish, adapted to intertidal habitats. These are places where the tide of the ocean comes in and out. Most fish that live in these habitats hide under wet seaweed or in tidal pools to not get pulled away when the tide goes out. Mudskippers are active when they are out of the water. They eat and interact with each other. For example, they defend their territories.
Mudskippers are different from their relatives, the gobies, in many ways. Gobies live only in the, which means they live both on land and in water. They have made many adaptations to live on the land. These include:
- Anatomical (body) and behavioral adaptations let them move better on land and water. These fish use their fins to move around in skips. This gives them their name, "mudskipper". They can also flip their strong body to jump up to 2 feet (60 cm) into the air.
- Mudskippers can breathe through their skin and the lining of their mouth (the mucosa) and throat (the pharynx). They can only do this when they are wet. This means mudskippers can only live in humid places, where the
This way of breathing is like how amphibians breathe. It is known as cutaneous air breathing. Another important adaptation that helps breathing while out of the water are their enlarged gill chambers. They keep a bubble of air there. These large gill chambers close tightly when the fish is above water. This keeps the gills moist and lets them to function. They act like a scuba diver's cylinders. They give oxygen for breathing also while on land.
- They dig deep burrows in soft sediment, or the bottom of an ocean or lake. This lets the fish thermoregulate, or keep its body temperature the same. They can also avoid ocean predators during the high tide when the fish and burrow are underwater. They also lay their eggs in these burrows.
The genus (a group of closely related species) Periophthalmus is by far the most diverse and widespread group of mudskipper. There are eighteen different types. Periophthalmus argentilineatus is one of the most widespread and well known species. It can be found in mangrove ecosystems and mudflats of East Africa and Madagascar east through the Sundarbans of Bengal, South East Asia to Northern Australia, southeast China and southern Japan, up to Samoa and Tonga Islands. It grows to a length of about 9.5 cm and is a carnivorous (meat-eating) opportunist feeder, which means it will eat anything it comes upon. It feeds on small prey such as small crabs and other arthropods. Another species, Periophthalmus barbarus, is the only oxudercine goby that lives in the coastal areas of western Africa (Murdy, 1989).
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