Tatami-iwashi is a processed food of baby sardines whose production process consists of cleaning and sifting, either before or after boiling, with a reed screen or fine mesh on a wooden frame, then drying them in the sun and forming them into a thin sheet (net-like).
たたみいわし（畳鰯）は、カタクチイワシの稚魚を洗い、生のままあるいは一度ゆでてから、葭簀（よしず）や木枠に貼った目の細かい網で漉いて天日干しし、薄い板状（網状）に加工した食品。