Iraqi authorities have opened an investigation into a mass die-off of fish in the country’s central and southern marshlands, the latest in a series of such incidents in recent years.

One possible cause for the devastation is a shortage of oxygen, triggered by low water flow, increased evaporation and rising temperatures driven by climate change, according to officials and environmental activists. Another is the use of chemicals by fishermen.

“We have received several citizens’ complaints,” said Jamal Abd Zeid, chief environmental officer for the Najaf governorate, which stretches from central to southern Iraq, adding that a technical inspection team had been set up.

He explained that the team would look into water shortages, electrical fishing, and the use by fishermen of “poisons”.

For at least five years, Iraq has endured successive droughts linked to climate change. Authorities further attribute the severe decline in river flow to the construction of dams by neighbouring Iran and Turkiye.

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The destruction of Iraq’s natural environment adds another layer of suffering to a country that has already faced decades of war and political oppression.

“We need lab tests to determine the exact cause” of the fish die-off, said environmental activist Jassim al-Assadi, who suggested that agricultural pesticides could also be responsible.

Investigations into similar incidents have shown that the use of poison in fishing can lead to mass deaths.

“It is dangerous for public health, as well as for the food chain,” al-Assadi said. “Using poison today, then again in a month or two … It’s going to accumulate.”