Blue Discus are round in shape and are very thin laterally. They can grow to diameters of six inches (15 centimeters) and are quite graceful in appearance. The Blue Discus has a small mouth with such a steeply rising forehead that the fish is nearly perfectly round. Its black anal and dorsal fins have long bases and the edges are rounded. These fins are tinted with red shades. Blue Discus have saber shaped, blue ventral fins, which are black at the edges, and caudal fins that are notched. In color, Blue Discus are usually pale blue or brownish. Usually older fish have more blue coloration. Their heads are tinted with purple iridescence. Although there are nine transverse stripes over the length of their bodies, usually only the first and last bands are readily seen. Pale blue stripes run along the entire body of the Blue Discus, and often spill over onto the dorsal and ventral fin coloration. When breeding, glands in the skin of Blue Discus will usually secrete fluids for their young to feed from, in a biological process similar to that of a lactating mammal.
Blue Discus are round in shape and are very thin laterally. They can grow to diameters of six inches (15 centimeters) and are quite graceful in appearance. The Blue Discus has a small mouth with such a steeply rising forehead that the fish is nearly perfectly round. Its black anal and dorsal fins have long bases and the edges are rounded. These fins are tinted with red shades. Blue Discus have saber shaped, blue ventral fins, which are black at the edges, and caudal fins that are notched. In color, Blue Discus are usually pale blue or brownish. Usually older fish have more blue coloration. Their heads are tinted with purple iridescence. Although there are nine transverse stripes over the length of their bodies, usually only the first and last bands are readily seen. Pale blue stripes run along the entire body of the Blue Discus, and often spill over onto the dorsal and ventral fin coloration. When breeding, glands in the skin of Blue Discus will usually secrete fluids for their young to feed from, in a biological process similar to that of a lactating mammal.