Mass Die-Off of Fish , Recorded in Australia's , Darling River.<br />Millions of dead fish <br />have been found in an Australian river.<br />NPR reports that government officials have said <br />that the cause is from dangerously low oxygen <br />levels in the water due to receding flood waters.<br />The dead fish were reportedly <br />discovered in the Darling River, <br />outside the town of Menindee.<br />According to government officials, the "ongoing"<br />event mainly involved bony herring, but also includes <br />murray cod, golden perch, silver perch and carp.<br />The Bony Herring species typically <br />booms and busts over time, Department of Primary Industries in New South Wales, via NPR.<br />It 'booms' in population numbers <br />during flood times and can then <br />experience significant mortalities <br />or 'busts' when flows return <br />to more normal levels, Department of Primary Industries in New South Wales, via NPR.<br />It 'booms' in population numbers <br />during flood times and can then <br />experience significant mortalities <br />or 'busts' when flows return <br />to more normal levels, Department of Primary Industries in New South Wales, via NPR.<br />NPR reports that an extreme <br />heat wave has further exacerbated <br />oxygen levels in the river. .<br />The Associated Press originally reported in late <br />February that large numbers of dead fish had <br />been observed in the Darling-Baaka River.<br />Mass fish die-offs were also observed <br />on the river outside of Menindee amid <br />extreme droughts in late 2018 and early 2019.<br />Mass fish die-offs were also observed <br />on the river outside of Menindee amid <br />extreme droughts in late 2018 and early 2019
