Cañaíllas de San Fernando Food and drink · San Fernando, Bahía de Cádiz, Cádiz Image of San Fernando, not of the place itself. Cañaíllas (a marine mollusk, Bolinus brandaris) gathered in the bay's tidal channels give the people of San Fernando their popular nickname, 'cañaílla,' reflecting the city's shellfish-gathering tradition. Photo: Xemenendura (CC BY-SA 4.0) What to see and do in San Fernando