Red Tailed Black Shark (Erromyzon kalotaenia)
The Red Tailed Black Shark, Erromyzon kalotaenia, is a striking freshwater cyprinid with a deep velvet-black body and a vivid red to orange-red tail. Despite the name, it is not a true shark, but an active bottom-to-midwater river fish with a shark-like body shape and strong territorial behaviour as it matures. Best kept as a single specimen in a spacious, mature aquarium, this species suits confident community setups with robust tank mates and plenty of cover.
Common Name
Red Tailed Black Shark, Red Tail Shark, Redtail Sharkminnow, Red-tailed Black Shark.
Scientific Name (Latin)
Epalzeorhynchos bicolor
Maximum Size
Usually around 12–15 cm.
| Feature | Detail |
|---|---|
| Origin | South Asia, Southeast Asia |
| Water Temperature | 22–28°C |
| Water pH | 6.0–7.5 |
| Water Hardness | 2–10 dGH |
| Compatibility | Best kept alone; requires robust tank mates and ample hiding places |
FAQ
What is the maximum size of the Red Tailed Black Shark?
Usually around 12–15 cm.
Is the Red Tailed Black Shark a real shark?
No, it is not a true shark. It is a freshwater fish with a shark-like body shape.
What kind of tank conditions does it require?
A spacious, mature aquarium with plenty of cover and robust tank mates. Water temperature should be between 22–28°C, pH between 6.0–7.5, and water hardness between 2–10 dGH.
Virginia Vance –
I kept one Red Tailed Black Shark in a 120-liter tank with compatible fish. It’s active and calm when given hiding spots. The red tail stands out and adds visual interest. Needs a large tank and careful pairing with other fish.
Joshua Mathis –
The fish looks beautiful with its deep black body and bright red tail. I had to keep it alone due to its territorial nature. It’s not for beginners, but once set up properly, it’s a great addition to a mature aquarium.
Jasmine Payne –
After a few months, the shark has become very calm and adapted well to the tank. I added plenty of plants and caves. It doesn’t attack other fish as long as they are not too small or slow-moving.