Nah-Sidigubur

Glossogobius giuris, the tank goby, is a species of goby native to fresh, marine and brackish waters from the Red Sea and East Africa through South Asia and the Indian Ocean to China, Australia and the islands of the Pacific Ocean. This species can also be found in the aquarium trade. It is also known as the bar-eyed goby, flat-headed goby and the Gangetic tank goby.

*Assamese Name: Patimutura maas
*Binomial name: Glossogobius giuris
*English name: Tank goby, Bar eyed goby
*Other names: Balia (Bengali), Abbrony, Bhangi-sidda (Kannada), Phursandi (Konkani), Kurudan, Pooan, Poolan, Wartoe poolah (Malayalam), Kharbi, Kharpa, Kharpya (Marathi), Gulah (Oriya), Boulla, Gooloowah (Punjabi), Nullatan, Uluvai (Tamil), Isakee doondoo (Telugu)
*Grows upto: 50cm max length
*Distribution: Widespread from Africa to Oceania: in the Red sea and East Africa and most inland freshwater bodies over the Indian ocean, western pacific, also in coastal estuarine waters from South Africa and Madagascar to India and south of China. 

The photographed as been taken from facebook page " Local Fish of Assam" . Link has been given in the right side of the column under "External Link" Section.