Vertebrate fauna of SE Asia
  

 

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Text and photos by Nick Baker, unless otherwise credited.
Copyright ゥ Ecology Asia 2020

 
 
     
   
   

 

   
   
 
Pygmy Halfbeak
   
   

Fig 1


Fig 2


Fig 3
 

 

 

 

 

 

 

 

 

 

 

 

 

Order : Beloniformes
Family : HEMIRAMPHIDAE
Species : Dermogenys collettei
Maximum Length : 7 cm

This surface dwelling, carnivorous fish is adapted to habitats varying from acidic, tropical forest streams to brackish mangrove streams.

It is identified by its small size and shape of the jaw. Males often have a red blotch on the dorsal fin, and can be aggressive towards other males. The species is ovoviviparous, meaning the young fry hatch internally in the female and are then born alive.

The Pygmy Halfbeak can be distinguished from the similar Forest Halfbeak Hemirhamphodon pogonognathus by the position of the dorsal fin which begins behind  the anal fin.

The species occurs in many Southeast Asian countries including Thailand, Malaysia, Singapore and Indonesia.   


Fig 1 : A 4cm specimen amongst pondside vegetation in a shallow, silty, open-country pond, Singapore.

Fig 2 : A female (6 cm), presumably in breeding condition, is closely followed by a smaller male (3 cm). Seen in a shallow, secondary forest stream, Singapore.

Fig 3 : Specimen in a brackish stream inlet, Pulau Sugi, Riau Archipelago, Indonesia.


References : F1