Environment Agency staff have spent the day dealing with an emergency at a canal in Grantham after hundreds of dead fish were discovered this morning.
It's thought they died through lack of oxygen caused by the hot weather.
Chemicals have now been added to the water to bring the oxygen levels back to normal.
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The black and white twins born to mixed race parents have spoken on Good Morning Britain.
Cold with some icy stretches to start. There will be sunny intervals and further blustery, wintry showers.