Young eels released to try to boost population
11 October 2013 Last updated at 11:33 BST
Thousands of young eels have been introduced at four sites in Lincolnshire to try to boost the dwindling population.
The number of eels arriving in Britain has decreased by about 90% in the last 30 years.
Gemma Dawson spoke to Laura Tewson from the Lincolnshire Rivers Trust and Andrew Kerr from the Sustainable Eels Group.