Sat May 17 01:12:14 UTC 2025: Here’s a summary of the text followed by a news article version:
**Summary:**
Invasive fish species are severely impacting Malaysia’s mega-biodiverse waterways, threatening native species and causing environmental damage. Introduced for commercial or hobbyist purposes, species like the suckermouth catfish are thriving and outcompeting local fish. While the Malaysian government has taken some measures, including releasing native fish and offering incentives for invasive species removal, citizen groups like the “foreign fish hunter squad” are actively involved in culling these invaders. The effort faces challenges, including the pervasiveness of the problem, pollution, and the adaptability of the invasive species. Experts suggest complete eradication is unlikely, emphasizing the need for continuous management and control.
**News Article:**
**Invasive Fish Threaten Malaysian Waterways, Citizen Groups Fight Back**
**Puchong, Malaysia** – Malaysia’s rivers and lakes are under siege, not by development or pollution alone, but by an invasion of foreign fish species that are pushing native aquatic life to the brink. From the Klang River outside Kuala Lumpur to waterways across the peninsula, invasive species like the suckermouth catfish are dominating freshwater habitats, threatening the delicate balance of Malaysia’s mega-biodiversity.
“More than 80 percent of rivers in the Klang Valley have been invaded by foreign fish species, which can cause the extinction of the rivers’ indigenous aquatic life,” said Dr. Kalithasan Kailasam, a river expert with the Malaysia-based Global Environment Centre.
Introduced through commercial ventures and the aquarium trade, these invasive species, including the peacock bass and Javanese carp, are rapidly reproducing and adapting to even polluted waters. The suckermouth catfish, in particular, is a major concern due to its ability to destroy nesting sites and contribute to riverbank erosion, a significant issue in flood-prone Malaysia.
Alarmed by the ecological threat, a citizen group known as the “foreign fish hunter squad,” led by Mohamad Haziq A Rahman, has taken action. This group regularly culls invasive species from rivers, having removed nearly 31 tonnes of suckermouth catfish by 2024. They are working to reclaim Malaysia’s rivers one fin at a time.
“Yes, this fish won’t be completely gone from our rivers,” said Haziq. “But if we don’t act now, it would be worse… At least we can reduce the population, than allow it to completely take over our local fish.”
The Malaysian government has also responded, implementing measures such as releasing millions of native fish, restricting imports of certain foreign aquatic species, and offering incentives to anglers for removing invasive species. In Selangor, anglers are paid one ringgit ($0.23) for every kilogramme of suckermouth removed.
Despite these efforts, experts like Professor Amirrudin Ahmad of Universiti Malaysia Terengganu warn that complete eradication is “almost impossible” due to the adaptability of the invasive species and the potential for climate change to expand their range. The focus is now on continuous management and control to protect Malaysia’s native aquatic ecosystems. Some are even researching uses for the suckermouth, such as biochar, fertiliser and collagen.
The battle for Malaysia’s waterways is ongoing, highlighting the complex challenges posed by invasive species in a world increasingly impacted by human activity and climate change.
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