About 250 people took part in en event to catch alien fish at Ampang Hilir lake, and release fish fry of local species into the lake. (Bernama pic) KUALA LUMPUR: Alien species of fish comprise as much as 95% of the fish population of Ampang Hilir lake, posing a serious threat to the balance of the country's freshwater ecosystem, a senior agriculture official said.

Isham Ishak, secretary general of the agriculture and food security ministry, said the ministry is reviewing efforts to tighten existing regulations, including the possibility of banning certain fish species identified as threatening the local ecosystem.

He called for greater efforts to curb the problem of foreign fish species being introduced into public waters, including community education to stop the practice of releasing unwanted pet fish into lakes, dams, and public irrigation areas.