大象传媒

Caz Graham visits the Environment Agency's coarse fish farm at Calverton in Nottinghamshire which produces millions of fish to restock rivers. The farm's manager, Alan Henshaw, shows Caz the breeding process. It begins with eggs being harvested from wild fish and, as she finds out, goose feathers are an essential tool in making sure those eggs are fertilised. The Environment Agency's farm has released fish into almost every river system in England and Wales. Caz witnesses the River Derwent, near Derby, being restocked with Grayling and Barbel.

Presenter: Caz Graham
Producer: Sarah Swadling.