Red Tail Sharks are an eye-catching freshwater fish that we’ve been drawn to for quite a while. Their simple yet striking appearance is something you don’t often see in other species. The average Red Tail Shark lifespan is between 5 and 8 years. The appearance of the Red Tail Shark is pretty straightforward. From a colour standpoint, there are only two colours to mention (black and red), and their bodies have a classic shark-like appearance. Red tail shark body may be up to 16 cm long and its life span is about 5 years. Its body is slim, elongated and flattened from sides with curved back.