Blue danio with a 6.5 – 7.0 pH, a water hardness of 8 – 12 dGH, and a temperature range of 73 – 77 °F (23–25 °C). Blue danios are egg-scatterers that spawn over coarse gravel beds. They will typically spawn at the first light of day. The eggs will hatch in about 36 hours. The taxonomic name honors A.F.G. Kerr, who collected the first specimen on Ko Yao Yai in 1929. Blue danio The blue danio or Kerr's danio,Turquoise danio ("Danio kerri") is a tropical fish belonging to the genus "Danio" in family Cyprinidae. The blue danio is found on the
Danio annulosus deep, instead of round or deep wide. No sexual dimorphism is present in Danio annulosus. Healthy adult individuals in life have dark stripes which include circles which are blue in color with the space in between including the circle centres are orange in color. A unique orange spot is seen in the front of the black cleithral spot. The holotype DU 50001 is an adult individual and probable female, 71.5 mm in length and collected form a Chittagong Division, Rangamati District, Borokal, pool at bottom of Shuvolong Waterfall on 28 Nov 2014. Danio annulosus Danio annulosus is a species of