Danio margaritatus of the celestial pearl danio, it was scientifically described and given the genus name "Celestichthys". In 2008, a more comprehensive study showed the celestial pearl danio was a member of the genus "Danio", with "Danio erythromicron" and "Danio choprae" as its closest relatives. The fish lives in small ponds created by seeping groundwater or overflow from small brooks or springs. Water temperature in January was rather low (22–24 °C), but as the habitat is very shallow, it would heat up quickly during hot spells, thus "D. margaritatus" is probably tolerant of temperatures above the low 20s. As in most water
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