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Explosion of invasive ‘janitor fish’ sparks mass removal operation in Indonesia’s capital

Officials aim to remove at least 10 tons as the invasive fish damage riverbanks and threaten Jakarta’s waterways.

  • On Friday, Jakarta authorities collected about 320 kilograms of invasive fish during a cleanup at a 19-foot-deep reservoir in East Jakarta's Ciracas neighborhood, continuing a city-wide campaign that has removed over seven tons since April 17.
  • Jakarta Gov. Pramono Anung ordered mass removals to combat invasive 'sapu-sapu' fish, which were imported decades ago for aquariums and now thrive in polluted rivers, destabilizing native ecosystems.
  • Joint authorities have caught nearly 70,000 fish since operations began, aiming to remove at least 10 tons from Jakarta's waterways. East Jakarta Mayor Munjirin noted the species causes 'structural damage to riverbank and embankment walls.'
  • The Indonesian Ulema Council warned that burying fish alive violates Islamic animal rights teachings, prompting Anung to pledge that all fish will be dead before burial at designated sites.
  • Ecologist Dian Rosleine from the Bandung Institute of Technology warns that removal is only a beginning; lasting solutions require improving wastewater management to prevent the Ciliwung River from returning to its current polluted condition.
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Explosion of invasive 'janitor fish' sparks mass removal operation in Indonesia's capital

Authorities in Indonesia’s capital are seeking to remove at least 10 tons of janitor fish from the city’s waterways.

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The Jakarta Provincial Government continues to conduct massive operations to capture janitor fish (an invasive species) in several areas. This activity aims to restore aquatic ecosystems from silting and erosion. This operation is a direct instruction from Jakarta Governor Pramono Anung to control the population of invasive species that damage river ecosystems and disrupt the stability of embankments. This measure was taken because janitor fish …

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The Jakarta Post broke the news in Jakarta, Indonesia on Thursday, April 23, 2026.
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