Millions of dead fish in an Australian river. What's the story?

Shocking recent videos show millions of fish dying on the surface of Australia's Darling Baka River, near a town called Meninde, in the state of New South Wales.

A number of residents documented the death of the fish, saying that most of them are from the family of "Abramis", along with other species such as moray and chick.

The recurrence of such incidents has raised questions about the reasons that led to the deaths of large numbers of fish, and whether this phenomenon was mainly caused by poor care of the aquarium in the area.

Sky News Arabia quoted local authorities in the region as explaining that the phenomenon is caused by low oxygen levels in the water, due to the decline in floods.

The shifts in the river led to the concentration of fish in the area near the canal, which affected the oxygen level.

Warmer water is known to retain less oxygen than cold water.

Fish need a higher level of oxygen to survive when in warmer waters, and Menenidi is a town of about 500 people, about 100 kilometres southeast of Bruken Hill.

Residents have repeatedly reproached the authorities, saying that the way the lakes in the area are emptied has harmful consequences for the environment.