Pliny the Elder [1st century CE] (Natural History, Book 9, 19): ...enter the Black Sea in shoals in search of less brackish feeding-grounds, each kind with its own leaders, and first of all the mackerel [amia], which when in the water is sulfur-colored, though out of water it is the same color as the other kinds. - [Rackham translation]

Isidore of Seville [7th century CE] (Etymologies, Book 12, 6:33): The rock-dwelling hamio is marked on its right and left sides by unbroken stripes of purple and other colors. It is called hamio because it is not caught except with a hook (hamus). - [Barney, Lewis, et. al. translation]

Thomas of Cantimpré [circa 1200-1272 CE] (Liber de natura rerum, Fish 7.11): Amius is a sea fish. It is stone-like, as Isidore says, that is, it has a stone inside. It is very beautiful, for on both sides it has, as it were, rods of a perpetual reddish color. But the rest of the body is indeed varied in different and gratuitous colors in the manner of a silken cloth. - [Badke translation/paraphrase]