Red-Tailed Black Shark

The Red-Tailed Black Shark, also known as the Red-Tailed Shark or Rainbow Shark, is a popular freshwater species in the aquarium trade. This striking fish is native to the rivers and streams of Thailand, where it can be found in clear, fast-moving waters with a moderate current. Its bold, contrasting coloration—deep black body with a bright red tail—makes it easily recognizable. The species typically grows up to 6 inches long, though some individuals can reach slightly larger sizes in captivity.

As an omnivorous fish, the Red-Tailed Black Shark feeds on a variety of foods, including algae, detritus, and small invertebrates. In its natural habitat, it scavenges the riverbed for organic material, while in aquariums, it is typically fed a combination of algae wafers, small pellets, and occasionally live or frozen foods like bloodworms and brine shrimp. It is known for its active nature and territorial behavior, especially in tanks where it may assert dominance over other bottom-dwelling species.

One of the key characteristics of the Red-Tailed Black Shark is its high adaptability to different water conditions. It thrives in slightly acidic to neutral pH levels and requires well-oxygenated water. The fish is best kept in a tank with ample swimming space and hiding spots, as it tends to be aggressive toward its own kind and other similarly shaped fish. While it is not typically a threat to other species, it can be quite assertive in claiming territory.

Red-Tailed Black Sharks are relatively hardy and can live for up to 5-7 years in captivity, though their lifespan can vary depending on water quality and tank conditions. Although they are commonly bred in aquariums, they are still widely available in the wild, and their population status is considered of least concern.

Fun Facts:
Despite their name, Red-Tailed Black Sharks are not true sharks but rather a type of freshwater fish belonging to the minnow family.

The bright red tail color of males becomes more vivid during mating season, which can be a fun indicator for aquarium enthusiasts.

Red-Tailed Black Sharks are known to be great algae eaters, helping keep the tank clean and free of excess algae growth.