Helen Mark visits the Wash, a vast bay in East Anglia, where the interests of fishing and conservation are finely balanced.

The Wash has been fished for centuries for cockles, mussels and brown shrimp, but it's also visited by thousands of migratory birds, as they crisscross the globe.

Fishing in the bay has been sustainably managed for the last 30 years, but next year things are changing, causing uncertainty and concern for the Wash fishing fleet.

Produced by Beatrice Fenton.