Danio annulosus Lake system in Rangamati district in the Chittagong division, Bangladesh. The species name annulosus is derved from the neo-Latin word meaning "ringed", from the color pattern on the side of the fish which resembles a pattern of dark rings. "Danio annulosus" is so far known only from a small pool below the Shuvolong waterfalls during the summer when the water was stand still in the pool. There is a good chance of finding them in Kaptai lake system formed by the damming of Karnafuli River, as a small stream drains the pool to kapati lake. "Danio annulosus" is the 25th
Danio annulosus species of the Danio identified. Just like all the chain danios "Danio annulosus" has chain like pattern instead of the striped patterns of zebra danios. As all the chain danios, Danio annulosus has the same color pattern containing a series of dark rings with light color space beside it, a complete lateral line, 14 circumpendular scales, have the first ray in the pectoral fin and a black humeral spot. "Danio annulosus" is different from the rest of the Puntius species by many features such as a much shorter pecotal and pelvic fins, the humeral spot is a bit wider and