Bleak - Alburnus alburnus
This small fish has bright silvery sides, a small head and a very large eye compared to its size. It has a forked tail and can be distinctly identified by a keeled belly and an upturned mouth with a protruding lower jaw.

Unless identified by a recognised expert, a photo is required. If the photo doesn't show the key ID features then in the comments box describe the size and identifying characters you have observed.
Rivers, or in canals close to the confluence with a river.
All year round, but especially in warmer months.
Live in shoals and are primarily surface feeders. Life span three to five years.
Widespread and frequent in England and Wales.
Fairly frequent in Leicestershire and Rutland in suitable watercourses.
Leicestershire & Rutland Map
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MAP KEY:
Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015