Malaysia warns against releasing pet fish into lakes as invasive species threaten native populations

KUALA LUMPUR — Malaysian environmental officials are urging the public to stop releasing unwanted aquarium fish into lakes and waterways, as alien species have come to dominate local ecosystems with alarming speed. Data from Tasik Ampang Hilir reveals that invasive fish now comprise approximately 95 per cent of the recorded fish population in the lake, a dramatic shift that threatens the survival of indigenous species. The proliferation of non-native fish, believed to have been released by aquarium hobbyists over time, has fundamentally altered the ecological balance of the freshwater body. Officials have attributed the invasion partly to the casual disposal of exotic pet fish, a practice that has become increasingly common as residents seek to rid themselves of unwanted aquarium specimens. The government has called on Malaysians to adopt responsible pet ownership practices, including proper rehoming or humane disposal methods rather than releasing fish into natural waterways. Environmental experts warn that the situation at Ampang lake serves as a cautionary example of how individual actions can cumulatively devastate local biodiversity, and are urging authorities to implement stricter awareness campaigns and enforcement measures.

Photo: Tasik Ampang Hilir lake with the Kuala Lumpur skyline behind. 龍崎 Jeffrey via Wikimedia Commons (CC BY-SA 3.0).