Ostricaio a person who sold Oysters and to which was considered a nobil profession passed down by generations of families . On painted boards of green , yellow , or black there was printed the name of the proprieta in Capital letters followed by his title . Ostricaro d Europ or Ostricaro Phisical . These were the true Oyster sellers from the lake of Fusaro . Other mobile Oyster sellers not of good quality were of   poor taste which had been fished from the seas of Castel Dell Ovo on the roks of Santa Lucia .