Description
The single-gill eel (Anguilla australis), also known as the native Australian eel, is a fascinating species found in the rivers, streams, and coastal regions of Australia. This is a rare species, not commonly found in the aquarium trade. Distinguished by its long, slender body and unique respiratory adaptation, this eel has captured the interest of aquarium enthusiasts. It is renowned for its ability to survive in low-oxygen environments due to its specialized single gill slit, which sets it apart from other eel species. In captivity, it requires specific care to thrive and display its natural behaviors.
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Features of a Single-Gill Eel
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Size: Grows up to 1.5 meters in length.
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Body: Long, cylindrical, and smooth, with a robust, muscular build.
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Color: Typically dark brown to olive-green, with lighter underparts.
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Gill Structure: Possesses a single gill slit on each side, unlike most eels that have multiple gill openings.
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Lifespan: Can live up to 20 years in suitable aquarium conditions.
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Behavior: Mostly nocturnal and burrowing, this eel is highly adaptable to different environments.
The Best Aquarium Size for Single-Gill Eel
The single-gill eel requires a large aquarium, preferably at least 200 litres, to accommodate its long, active body. It is important to choose a tank that offers both horizontal space and depth to allow for natural swimming and burrowing behavior. The eel’s need for ample space will ensure it feels secure and comfortable.
Check out these suitable aquarium brands:
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Tank Mate Compatibility for Single-Gill Eel
While the single-gill eel is generally peaceful, it may become territorial or exhibit predatory behavior toward smaller species. Suitable tank mates include:
Rainbowfish
Diet for Single-Gill Eel
The single-gill eel is an opportunistic carnivore, feeding on a variety of live and frozen foods. Its diet should include:
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Live or Frozen Worms (earthworms, bloodworms)
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Small Fish
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Crustaceans (brine shrimp, daphnia)
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Vegetables (blanched spinach, zucchini)
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Pellets designed for carnivorous or omnivorous fish
A balanced diet promotes healthy growth and longevity.
Check out our extensive range of aquarium fish foods, or live foods.
Aquarium Setup for Single-Gill Eel
Aquarium Filtration
Single-gill eels are hardy but require good filtration to maintain clean water. A strong filtration system ensures optimal water quality by removing waste and toxins. A sponge filter is recommended to avoid sucking in smaller eels and to provide gentle filtration.
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Aquarium Plants
The eel appreciates a planted tank, which offers hiding spots and a natural environment. Hardy plants like Java Fern, Anubias, and Java Moss thrive in these conditions. These plants also help improve water quality by absorbing excess nutrients.
Check out our Anubias on Driftwood.
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Aquarium Lighting
As a nocturnal species, the single-gill eel does not require bright lighting. Moderate to low light is sufficient, allowing the eel to remain active during the night while resting during the day. A timer can help replicate natural day-night cycles.
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Aquarium Heating
The single-gill eel thrives in warm waters, with temperatures ranging between 22°C and 28°C. A reliable aquarium heater is essential to maintain a stable environment, especially in cooler climates.
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Aquarium Substrate
A soft substrate, such as fine gravel or sand, is ideal for the eel. It enjoys burrowing and requires a substrate that is easy to dig into without causing harm to its sensitive skin.
A variety of Substrates are available at Coburg Aquarium.
Aquarium Decorations
Provide various hiding places using rocks, driftwood, or ceramic caves. These decorations replicate the eel’s natural habitat, offering it security during the day. The eel may also use these areas to hide when stressed or when it feels threatened.
After more nice quality decorations? Check our Aquarium Ornaments.
By understanding the specific needs of the single-gill eel and replicating its natural environment, aquarium owners can ensure this unique species thrives in captivity.
