Clare Brook, the CEO of ocean conservation charity Blue Marine Foundation, said by the end of June parts of UK waters were up to 5°C warmer than usual.
She said this can lead to fish moving into new areas and food chains.
Brook said: “The ocean is our best climate ally. Without the ocean, the earth would be 36 degrees hotter. Humanity wouldn’t be possible.
“It’s the world’s largest carbon sink, it absorbs almost half of the carbon we produce and it provides over half of the planet’s oxygen, but the ocean can only provide these vital functions if it’s full of life.”
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