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Reedfish

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The reedfish, also known as the ropefish or snakefish, is a unique species of fish. Its scientific name is *Erpetoichthys calabaricus*. This fish is the only member of its genus, *Erpetoichthys*. It belongs to the family Polypteridae, which also includes the bichirs. These fish are native to West and Central Africa. They live in fresh or brackish waters.

Erpetoichthys calabaricus
Erpetoichthys calabaricus

They prefer warm, tropical environments. These waters are often slow-moving or standing still. You can find them near dense plant growth or reeds.

One of the most amazing things about the reedfish is how it breathes. Most fish rely entirely on gills to extract oxygen from the water. However, the reedfish possesses a pair of lungs in addition to its gills. This allows the fish to breathe atmospheric air. This adaptation is vital for survival in oxygen-poor water. It also allows the fish to survive for an intermediate amount of time out of the water. Because of this, they can explore land by slithering like a snake.

Erpetoichthys calabaricus
Erpetoichthys calabaricus

The reedfish has a very distinct body shape. It looks much like a snake or an eel. Most long fish, such as eels, achieve this shape by adding caudal vertebrae to their tails. The reedfish uses a different method called precaudal elongation. It grows twice as many precaudal vertebrae as its sister genus, *Polypterus*. This means it adds more bones to the front part of its body rather than the tail. This structural difference gives them their long, slender appearance.

Erpetoichthys calabaricus
Erpetoichthys calabaricus

Physical appearance can help scientists identify the sex of a reedfish. The sexes are very similar in their maximum length. However, females generally average heavier than males of the same length. You can also tell them apart by the shape of their anal fin. Coloration varies slightly between the sexes as well. Males are generally more olive-green in color. Females are usually a more yellowish-brown. The body is dark on the top and sides, with lighter yellowish or orangish underparts.

Erpetoichthys calabaricus
Erpetoichthys calabaricus

Reedfish are nocturnal animals, meaning they are most active at night. They have a varied diet consisting of many different prey items. They eat annelid worms, snails, and small crustaceans like shrimp. They also consume insects, both adults and their larvae, as well as small fish. When moving slowly, they use their pectoral fins to navigate. When they need to move quickly, they switch to an eel-like swimming style. This involves using full-body movements and the caudal fin.

Erpetoichthys calabaricus
Erpetoichthys calabaricus

The reproductive process of the reedfish is quite specific. Females deposit small batches of eggs between the anal fins of the male. The eggs are fertilized there. The male then scatters the eggs among aquatic vegetation. The eggs stick to the plants or the substrate. The larvae hatch very rapidly, after only 70 hours. They remain attached to the vegetation for a while. After about 22 days, the larvae become independent. This happens once they have consumed their yolk sac.

Erpetoichthys calabaricus
Erpetoichthys calabaricus

In the wild, the reedfish faces several environmental challenges. The species is currently classified as Near Threatened by the IUCN. Habitat loss is a major problem for these fish. This loss is driven by the creation of palm oil plantations and other agriculture. Deforestation and urban development also destroy their natural homes. Wetland drainage for farms or cities further reduces their habitat. While they are caught for food and the aquarium trade, these catch levels are not currently the main threat.

Erpetoichthys calabaricus
Erpetoichthys calabaricus

In captivity, reedfish are known for having a distinct personality. They are inquisitive and peaceful, though they may eat smaller fish. They are often difficult to keep in aquariums. This is because they are prone to jumping out of tanks. They may even try to enter water pumps, which can be fatal. They are also sensitive to changes in nitrogen chemistry or pH levels. While scientists have observed them spawning in captivity, no hatchlings have been reported to survive to adulthood yet.

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File:Erpetoichthys calabaricus.jpg
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