The sea off the coast of East Anglia is experiencing category two marine heatwave conditions, the Met Office said.
The third heatwave of the year has hit the area, including the coast off Norfolk, Suffolk and Lincolnshire, with temperatures expected to rise to more than 30C by midweek.
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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