IPOH: An ecological disaster is happening in major rivers in the country with the invasion of alien fishes from the mighty Amazon river of Brazil and Chao Phraya in Thailand.

Sungai Pahang is now home for the red tail catfish (Hemibagrus wyckoides) of the Mekong river system, and Sungai Perak the gargantuan Chao Praya high fin catfish.