Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Fish 7.39): The fundula [fundulus] fish is small and riverine. It has its name from this fact: it always seeks the bottom [fundus]. Hence it is rarely or never seen on the surface of the water. It provides sweet food, but is quite indigestible. It is varied in color. - [Badke translation/paraphrase]