As the adult male reaches full size (approximately 1 metre), it begins to turn into a female, and turns yellow. It will then mate, lay eggs, and die within about a month. Due to this short lifespan, female ribbon eels are a relatively rare sight.
Females are yellow with a black anal fin with white margins on the fins. So, they are not all different species, they are just differently coloured, according to sex…. which they can change during their life times!