What is "tarpum"

Tarpum \Tar"pum\, n. (Zo["o]l.) A very large marine fish ( Megapolis Atlanticus) of the Southern United States and the West Indies. It often becomes six or more feet in length, and has large silvery scales. The scales are a staple article of trade, and are used in fancywork. Called also tarpon, sabalo, savanilla, silverfish, and jewfish.

n. A large marine fish ((taxlink Megalops atlanticus species noshow=1)) of the southern United States and the West Indies, with large silvery scales.