The athérine or sand smelt is a small fish often caught in the English Channel and western Mediterraean that swims in enormous schools, and is often fried up whole as an inexpensive meal.
It has many names in French, including abusseau, belek bihan, faux éperlan, grasdeau, grado, kanchua, petit curé, prêtro, petit prêtre, prêteau, rosette, roseré, trogue or troyne.
Image by Citron / CC-BY-SA-3.0