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Text and photos by Nick Baker, unless credited to others.
Copyright © Ecology Asia 2025

 
     
 

 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

   
   
 
Grey Knight Goby  -  Stigmatogobius sadanundio
   
   

Fig 1


Fig 2


Fig 3


Fig 4

 

 

 

Order : Perciformes
Family : GOBIIDAE
Species : Stigmatogobius sadanundio
Maximum Length : To at least 6.2 cm, possibly to 9.0 cm

The Grey Knight Goby inhabits tidal river estuaries, mangrove and the lower reaches of freshwater streams.

It is benthic in habits, sometimes occurring in water just a few centimetres deep. It is carnivorous, and feeds on fish fry, aquatic invertebrates and insect larvae.

Identifying features include the black spots on the flanks, which are arranged in broken rows parallel to the body, and the long first dorsal fin, which has a black blotch at the base. The second dorsal fin is shorter, but broader, than the first the anal fin is well developed, and the tail fin is relatively large and rounded. All fins, except the first dorsal fin, are speckled to some degree.

The species ranges from coastal areas of Pakistan eastwards through the Indian subcontinent and Sri Lanka. In Southeast Asia it occurs in the western half including Myanmar, Thailand, Cambodia, Peninsular Malaysia and Singapore. In Indonesia it occurs in coastal areas of Sumatra.


Fig 1 : Grey Knight Goby, in full sunlight, in the lowermost stretch of a freshwater stream flowing into Burau Bay, Langkawi, Peninsular Malaysia.

Fig 2 : Habitat of the Grey Knight Goby at Burau Bay - a shallow, rocky freshwater stream with sandy substrate.

Fig 3 : Specimen from Pulau Semakau, a partly mangrove-fringed island off Singapore.

Fig 4 : Mangrove habitat at Pulau Semakau, Singapore.


References :

Larson, H.K. and Lim, K.P. 1997. A Guide to Gobies of Singapore. Singapore Science Centre.

Lim, K.P. and Ng, K.L. 1990. A Guide to the Freshwater Fishes of Singapore. Singapore Science Centre.