Trophic polymorphism in the Malaysian fish <I>Neolissochilus soroides </I>and other Old World Barbs (Teleostei, Cyprinidae)

Abstract

The objectives of this paper are to 1) document the occurrence of pronounced intraspecific trophic polymorphism in the Southeast Asian cyprinid species Neolissochilus soroides (Duncker, 1904), based mainly upon intensively studied samples from Sungai Gombak in central Malaysia; 2) provide biological information relevant to this example; 3) point out a number of similar examples of intraspecific trophic polymorphism in other Old World Cyprinidae; and 4) indicate the significance of such polymorphism in the systematics and evolutionary biology of Cyprinidae.