Sicyopterus griseus, the Clown goby, is a species of goby endemic to India and Sri Lanka, where it is found in estuaries, blackwaters, and fresh waters. The populations within Sri Lanka is not yet internationally accepted, due to lack of evidences (Jayaram 1999). This species can reach a length of SL.
References
https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=638021 http://indiabiodiversity.org/species/show/233536 http://www.marinespecies.org/aphia.php?p=taxdetails&id=277431