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Quiet and calm, she lifted the gun, aimed and fired — spearing a red morwong through its middle.

Her friend Tim Charody, who taught her to spearfish during Australia’s coronavirus lockdown, had already caught another morwong, a common fish in these waters.

An Australian study, published on Monday in the journal Nature Climate Change, focused on the long-lived fish species called the banded morwong in the Tasman Sea, between Australia and New Zealand.

The banded morwong can live nearly 100 years.

Scientists, using long-term and current data, found that the morwong's growth in some areas has been slowed by a jump in sea surface temperatures of nearly 2 degrees Celsius over the past 60 years in the Tasman Sea, one of the most rapid increases in the southern hemisphere's oceans.