Fish play an integral part in the thriving underwater ecosystems however a new study has found that a concerning number of large fish stock in Australian waters have declined by a third in recent years. The research, which looked at 200 species at over 500 different marine locations around the country, discovered a downward trend in populations of fish such as Bream and Snapper, over the past 10 years. Labeled as “a wake up call” for Australia, over-fishing has been suggested as the main cause of this decline. David Booth, Professor of Marine Ecology at the University of Technology, Sydney joined us the line to discuss.