Guardian: Ocean temperatures off the coast of Tasmania have risen to 4.5C above average twice the temperature rise that led to the mass coral bleaching of the Great Barrier Reef in a marine heatwave that has lasted more than 130 days.
The above-average temperatures were first recorded in December and have continued into April, affecting the oyster, salmon and abalone industries, as well as stressing already declining kelp forests.
Dr Alistair Hobday, a senior principal research scientist with the...