The elver fishing fleet of San Juan de la Arena Curiosity · Soto del Barco, Avilés, Asturias Image of Soto del Barco, not of the place itself. Between November and March, on moonless nights, eighty or a hundred boats work the mouth of the Nalón trailing small nets after elvers; the village passes for the elver capital of Spain and its fish market handles thousands of kilos each season. Photo: Ivan Gonzalez (CC BY-SA 3.0) What to see and do in Soto del Barco