tarpum \tar"pum\, n. zool.
   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.
   1913 webster
see also:
megapolis atlanticus tarpon sabalo savanilla silverfish jewfish