Iraqi authorities on Monday launched a probe into a mass die-off of fish in the southern marshlands, the latest in a string of such events in recent years.

One possible cause for the localised die-off could be a shortage of oxygen sparked by low water flow, increased evaporation and rising temperatures fuelled by climate change.

Another possible reason could be chemicals used by fishermen to make it easier to catch their prey, local officials and activists told AFP.

AFP images showed large quantities of........

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