Fish under threat from ocean oxygen depletion, finds study

Oxygen levels in oceans have fallen 2% in 50 years due to climate change, affecting marine habitat and large fish such as tuna and sharksThe depletion of oxygen in our oceans threatens future fish stocks and risks altering the habitat and behaviour of marine life, scientists have warned, after a new study found oceanic oxygen levels had fallen by 2% in 50 years.The study, carried out at Geomar Helmholtz Centre for Ocean Research in Germany, was the most comprehensive of the subject to date. The