The spined loach is a small freshwater fish that spends most of the time buried in the silt of riverbeds. It is believed be in the UK as a result of the melting from the last Ice Age when the UK was connect to Europe. After the Ice Age rescinded, the ocean water levels increased for a time before decreasing enough to essentially separating some of the species from the rest that live in Europe. Brett Westwood joins Environment Agency Fisheries Officer Andy Beal and his team conducting a survey of this secretive and rare animal at Morton's Leam; a 15th Century river artificial course of the River Nene in Cambridgeshire.