Daphnia is a genus of small planktonic crustaceans, 0.2 to 6 mm in length. Daphnia are characterized by flattened leaf-like legs used to produce a water current for the filtering apparatus.

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.

Found in freshwater environments.

All year. 

Widespread in Britain.

Status in Leicestershire and Rutland not known.