The black widow is occasionally confused in name with the merry widow, even though in appearance they’re decidedly dissimilar.
The black widow is a smart fish, its dark colouring offers an outstanding contrast to lighter coloured fish. The big anal fin is fan-shaped and black in hue. This colour suffuses the entire of the rear portion of the body up to and including the dorsal fin. Two or 3 vertical lines of black are also visible on the remainder of the body. The caudal fin is so translucent that it is occasionally challenging to see. Black widows up to about 1.125 inch long have the deepest colouring, but as they grow over this length the markings turn out to be paler until they’re truly a dark shade of grey. The average length of a fully grown fish is 2.5 inch.
Sexing is greatest ascertained by selecting the1 females when they’re obviously filled with spawn. They breed according to the standard description for egg-layers.