Dermogenys brachynotopterus
Dermogenys brachynotopterus, the Gangetic halfbeak, is a species of viviparous halfbeak. Distribution 
The Gangetic halfbeak is native to India and Bangladesh. Although IUCN] and FishBase state that it is only known from the holotype discovered in the Hooghly estuary in West Bengal, India,

IUCN postulates that Dermogenys brachynotopterus and Dermogenys burmanica could be the same species, with D. brachynotopterus having the taxonomic seniority. Habitat and biology 
It is a pelagic species of fish, and inhabits the brackish waters of estuaries. References 

brachynotopterus
Fish of Bangladesh
Fish of India
Fish described in 1853
Taxa named by Pieter Bleeker