The zander (or Stizostedion lucioperca) are a member of the perch family. They are predatory in behaviour and will eat a variety of small fish species. Unlike their striped, spiky cousins they are not a native species to the UK and due to this they have been routinely culled in ‘some’ British waterways.
In 1878 they were legally introduced into Woburn Park and later the relief Channel. However, they were also illegally introduced into several British fisheries since then where they have successfully populated alongside notable rivers such as the Ouse, Severn and the Warkwickshire Avon. As well as the Fen drain systems All of these river and drain systems have produced zander to well over double figures and the current British record of an astounding 22lb came from such a venue.
In addition to these waterways the zander has been very successful in populating the inland waterways we know as canals. To my knowledge they inhabit (in no particular order) the Oxford, Trent and Mersey, Grand Union, Gloucester and Sharpness, Ashby, South Stratford water waterways. There may well be others. Unlike the other waterways described the zander on canals are routinely culled due to their non native status. Due to this the zander population is regularly disrupted and large specimens are rare.