- Listed on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species as endangered in the UK
- UK Biodiversity Action Plan Priority Species
- Listed on Appendix II of the Bern Convention and Annex IVa of the European Commission Habitats Directive
- It is also protected under schedule 2 of the Conservation (Natural Habitats etc) Regulations 1994, and it is illegal to kill, injure or take a shad from the sea under Section 5 of the Wildlife and Countryside Act 1981.
Appearance: twaite shad are very similar to allis shad. They are members of the herring family and enter freshwater only to spawn. They have a silvery, flattened and typically fish-shaped body. The twaite shad has a more darkened back than the allis shad. A thin fatty membrane covers the front and rear parts of the eye and the lower jaw fits into a notch in the upper jaw. They have a deeply forked tail with large scales at the base. Twaite shad have a number of dark spots behind the gill cover, sometimes up to 10 spots. They have an anal fin ray count of 19-23.
British record: 2lb 12oz (British record committee 2015)
Lifespan: four to seven years