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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A mostly dry day but with a few showers, particularly during the evening.
A generally cloudy day, although some bright or sunny intervals are also likely.
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