Periophthalmodon septemradiatus

Periophthalmodon septemradiatus is a species of mudskipper found along tropical shorelines of the eastern Indian Ocean where it occurs in marine, brackish and fresh waters from India to Mekong Delta Vietnam, Indonesia. It is found along in estuaries as well as in the rivers.

Periophthalmodon septemradiatus
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Gobiiformes
Family:	Oxudercidae
Genus:	Periophthalmodon
Species:	P. septemradiatus
Binomial name
Periophthalmodon septemradiatus (Hamilton, 1822)
Synonyms[2]
Gobius septemradiatus Hamilton, 1822 Gobius tredecemradiatus Hamilton, 1822 Periophthalmodon tredecemradiatus (Hamilton, 1822) Periophthalmus borneensis Bleeker, 1850

This species inhabits mud banks which are covered by such vegetation as mangroves, nypah palms where the water is of very low salinity, near 0 ppt, in the upper reaches of estuaries and in small tributaries.[3] It can grow to a length of 10 centimetres (3.9 in) TL.

This species is of no interest to local commercial fisheries.[2] The specific name means "seven rayed" and refers to the seven short rays in this fish's first dorsal fin.[4]

P. septemradiatus is the only fish known to communicate acoustically while out of water and when they are alarmed they dash towards land rather than water.[3]

Male 'Periophthalmodon septemradiatus' in nuptial coloration taken at Taki Golpata Forest

Male 'Periophthalmodon septemradiatus' in nuptial coloration taken at Sundarbans, Bangladesh