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Grey Knight Goby
   
   

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 Burma, 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 : F1, F2