Eldritch Creatures: Piscadantine

From publisher blurb: Piscadantine - False Adamantine Fish Dumb and bullish, piscadantine, false adamantine fish, or rustfish are a scourge when the enter a local waterway. They prey on fish and fishermen alike, eating whatever they please and shrugging off blows from larger creatures. Worse though is the difficulty they bring to boats, as they seem capable of breaking through thin hulls with ease to get at the more edible occupants. Includes a Specific suit of hide armor made from alchemically treated Piscadantine Scales!