Vertebrate fauna of SE Asia
  

 

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

 
 
     
   
   

 

   
   
 
Indo-Pacific Bottlenose Dolphin
   
   

Fig 1


Fig 2


Fig 3


Fig 4



 

 

Order : CETARTIODACTYLA
Infraorder : Cetacea
Family : Delphinidae
Species :
Tursiops aduncus

Total Length : up to 2.6m
Weight : Up to 230 kg
Females are slightly smaller than males.

The Indo-Pacific Bottlenose Dolphin Tursiops aduncus was confirmed as a separate species from the Common Bottlenose Dolphin Tursiops truncatus in 1998. It is the most likely of the three species in the genus Tursiops to be encountered in the waters of Southeast Asia.

This species occurs in coastal waters of the Indian Ocean, along the coast of mainland Asia, and amongst the islands of the Indo-malayan Archipelago as far east as northern Australia and parts of the western Pacific Ocean.

Its skin colour is plain grey, somewhat darker dorsally and paler ventrally. There are often darker spots along the lower flank and on the belly. The dorsal fin is high, fairly straight along the anterior margin but strongly curved along the posterior margin.

The beak is stout and relatively thick when compared with other dolphin species. This species feeds predominantly on fish but will also take squid.

Groups of over 100 individuals are sometimes reported but typical pod numbers are around 10 individuals or so.

Bottlenose dolphins are highly intelligent but, sadly, are frequently kept captive in money-making oceanariums for human 'entertainment'.


Fig 1 : Dorsally the skin is plain in colour, greyish under normal light but here is brownish in the late afternoon sun.

Fig 2 : This pod off Pungu Island, Western Flores, Indonesia, comprised eight individuals - a typical number for the species.

Fig 3 : Profile of the stout beak, with pinkish lips.

Fig 4 : The dorsal fin is large and strongly curved along the posterior margin.


References : M5