On Friday, April 24, 2026, Jakarta Pusat authorities detained five men from Cikarang, West Java, after they were caught catching and processing suckermouth catfish (ikan sapu-sapu) from the Ciliwung River for sale as food ingredients.
The men were apprehended by Satuan Polisi Pamong Praja (Satpol PP) officers in the Sawah Besar district, near Santa Ursula School in Pasar Baru, following a public complaint about suspicious activity along the riverbank. According to Satpol PP Sawah Besar chief Darwis Silitonga, the suspects admitted to harvesting the fish to sell the meat to intermediaries in Cikarang for use in siomai production, although retaining the eggs for resale as fishing bait.
Field inspections revealed the men were cleaning and separating the fish parts directly on the riverbank, dividing the meat, eggs and skin. All five individuals stated they had no identification documents except one person who possessed a KTP (Indonesian identity card). The group reportedly targeted the river during low tide or when water flow was reduced, making it easier to catch the fish.
Each individual was capable of catching approximately 20 kilograms of suckermouth catfish per day, meaning the group could collect up to 100 kilograms daily. Satpol PP confiscated the entire catch and destroyed it by burial, in accordance with standard procedure for illegally obtained aquatic resources. Officials emphasized that the fish, which thrive in polluted urban waterways, are not safe for human consumption and warned against distributing the meat for food products.
The incident highlights ongoing concerns about the unregulated harvesting of invasive species from contaminated rivers in Jakarta, where such fish are known to absorb toxins and heavy metals. Authorities continue to monitor riverbanks for illegal fishing activities that pose public health risks and undermine environmental management efforts.
Environmental and Public Health Risks of Suckermouth Catfish Consumption
Suckermouth catfish, originally native to South America, have become an invasive species in many tropical waterways, including Jakarta’s rivers. Their presence in the Ciliwung and other urban waterways is often seen as a sign of ecological imbalance, as they thrive in low-oxygen, polluted conditions where native species cannot survive.
While the fish are sometimes promoted as a sustainable food source in their native habitats, specimens caught in heavily polluted rivers like the Ciliwung may accumulate dangerous substances such as lead, mercury, and industrial chemicals. Consuming fish from such environments poses significant health risks, particularly with regular intake, and is discouraged by food safety authorities.
In this case, the men’s intention to process the fish into siomai—a popular Indonesian street food—raised alarm among local residents and health officials. Satpol PP emphasized that no part of the fish caught from the Ciliwung should enter the food chain, and all seized specimens were destroyed to prevent potential distribution.
The Jakarta Environmental Management Agency has previously issued advisories against consuming fish from urban rivers due to contamination risks, though enforcement remains challenging due to the informal nature of such harvesting activities.
Legal and Enforcement Response by Jakarta Authorities
Satpol PP, the municipal civil police unit responsible for maintaining public order in Jakarta, acted on a citizen report to intervene in the activity. Their response included detaining the individuals, seizing the fish, and coordinating the destruction of the catch. The agency operates under Jakarta’s provincial regulations governing public order and environmental protection.
No formal criminal charges were reported in the immediate aftermath of the detention, as the primary action was administrative intervention and public awareness. However, repeated offenses could lead to escalated penalties under local ordinances governing illegal resource extraction and public health violations.
The case underscores the role of community vigilance in identifying unusual activities along Jakarta’s waterways. Authorities have encouraged residents to report suspicious fishing or harvesting behavior, particularly when it involves species known to thrive in contaminated environments.
Broader Context of Invasive Species Management in Jakarta
The suckermouth catfish (Hypostomus plecostomus and related species) was introduced to Southeast Asia through the aquarium trade and has since established wild populations in rivers and canals across the region. In Jakarta, they are frequently observed in slow-moving, turbid waters and are known to tolerate poor water quality.
While some communities have explored controlled harvesting of invasive species for ecological management, experts warn that unregulated collection—especially from polluted sources—can inadvertently spread the species or create false perceptions of safety. Proper management requires coordination between environmental agencies, fisheries departments, and public health officials.
As of the date of this incident, no large-scale official program exists for the safe harvesting or utilization of suckermouth catfish from Jakarta’s rivers. Any such initiative would require rigorous water quality testing, species verification, and adherence to food safety standards before consideration for public consumption.
Moving forward, Jakarta authorities continue to monitor water quality and invasive species presence in the city’s rivers. Public advisories remain in place against consuming fish from urban waterways unless explicitly certified safe by authorized health and environmental agencies.
For updates on environmental monitoring and public health advisories related to Jakarta’s waterways, residents are encouraged to consult official channels from the Jakarta Environmental Management Agency and the provincial health office.
If you have information about unusual fishing activities or environmental concerns in your area, consider reporting them to local authorities. Sharing verified information helps protect public safety and supports efforts to maintain the ecological health of shared urban spaces.