Invasive suckermouth catfish are swarming waterways across Indonesia and Malaysia, causing significant disruption to local ecosystems and fishing industries [1].
This biological invasion threatens regional biodiversity and the livelihoods of people dependent on these waters. Because the fish lack natural predators in Southeast Asia, they can rapidly dominate habitats and outcompete native species.
In Jakarta, workers from the Jakarta Environmental Agency have been deployed to the Ciliwung River to mitigate the infestation. Reports said these workers cast their nets into the river's neck-deep, milky-brown water to remove the fish [1].
Also known as janitor fish, the suckermouth catfish is native to South America [1]. The species has established a strong foothold in the Ciliwung River in Indonesia and the Klang Valley in Malaysia due to favorable environmental conditions [1].
The proliferation of the species creates a ripple effect through the aquatic food chain. By occupying the bottom of the riverbeds and consuming resources, they displace indigenous fish and disrupt the balance of the waterways.
Efforts to control the population remain difficult. The ability of the fish to thrive in degraded water conditions allows them to survive in urban rivers where other species might struggle, making the Ciliwung River an ideal breeding ground [1].
“Invasive suckermouth catfish are swarming waterways across Indonesia and Malaysia”
The spread of suckermouth catfish highlights the vulnerability of Southeast Asian waterways to non-native species. When an invasive species finds a habitat with few natural predators and high tolerance for pollution, it can permanently alter the local ecology, leading to long-term economic losses for the fishing industry and a decline in native aquatic biodiversity.
