A name in Bermeo for the twaite shad or gizzard shad from a family of white, migratory fish. The shad is a bony, tasty, oily fish similar to herring, which travels up rivers in spring and is found in deep lakes. In France it is found in the Gironde where it is often grilled over vine shoots or stuffed with sorrel, and in the Loire, where it may be stuffed with beurre blanc. The roe is a great delicacy and shad is also used raw in sushi. Members of the family include Allis shad (Alosa alosa) and the smaller twaite shad or gizzard shad (Alosa fallax).