Authorities believe marine heatwave conditions may have led to the death of around 30,000 fish at Gnoorea Beach, south of Karratha. Authorities believe marine heatwave conditions may have led to the death of around 30,000 fish at Gnoorea Beach, south of Karratha. Heatwaves, Marine Biology, Climate Change, Oceans and Reefs, Fish, Fishing and Aquaculture Industry, Animals Latest business news