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Low Dissolved Oxygen Levels behind Mass Fish Death in Australian River

Editor

Laila Afifa

18 March 2023 21:09 WIB

Dead fish floating near Widuchowa in Poland are caught in a dam by the banks of Oder river in Friedrichsthal, Germany August 18, 2022. A large overgrowth of toxic algae linked to industrial pollution is the most likely culprit behind mass fish deaths in the river Oder, a German research institute said. REUTERS/Kuba Stezycki

TEMPO.CO, Sydney - Low levels of oxygen in Australia's second longest river were to blame for a mass fish die-off recently in a remote part of New South Wales state, environmental authorities said.

Thousands of dead fish have been found this week in the Darling River near the town of Menindee, around 1,000 km west of the state capital Sydney.

It follows fish deaths in the same area in 2018 and 2019 where up to a million fish died from poor water flow, poor water quality, and sudden temperature changes.

The NSW Department of Planning and Environment's water division said on Twitter that "dissolved oxygen levels remain a concern for fish health" in the area.

"There is a large number of fish deaths (predominantly Bony Herring) in the Darling River between Lake Wetherell and Menindee township," the agency said on Friday.

Hundreds of thousands of dead fish had been found in the river, and state fisheries officers had been sent to the area to assess the issue, the Australian Broadcasting Corporation reported on Saturday.

Footage posted to Twitter by SBS showed a boat navigating through thousands of dead fish blanketing the entire surface of the river.

The state planning and environment agency warned river oxygen levels could fall further this weekend as temperatures rise before cooler conditions return next week.

REUTERS

Editor's Choice: Mass Fish Deaths Reported on Bengawan Solo River

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