On Monday, about 800 to 900 dead fish were spotted in the waterway flowing through Bishan-Ang Mo Kio Park.
Since then, the Public Utilities Board (PUB) has enlisted contractors from the National Environment Agency (NEA) to clean up the water which is part of the Kallang River, Channel NewsAsia reported.
“A site check was carried out immediately and NEA’s contractors were activated to remove the dead fish,” a PUB spokesperson said.
“Clean-up operations which commenced since (Monday) evening at the affected stretch of the river are largely completed.”
However, after conducting laboratory tests on the water condition, the PUB highlighted that they couldn’t find anything unusual—raw water quality and dissolved oxygen levels are within the normal range.
Last February, a similar incident took place at the same park, but then, the PUB confirmed that the deaths were due to lower levels of dissolved oxygen in the water.
Most of the dead fish were identified to be cichlids and some have been sent to the Agri-food and Veterinary Authority of Singapore (AVA) for examination for further investigation.
“As of now, the water quality of the river in Bishan Park is normal, live fishes can be seen in the water and the public can continue with their activities at Kallang River @Bishan-Ang Mo Kio Park,” the PUB spokesperson added.
“PUB will continue to monitor the situation.”