The Collaborative International Dictionary of English v.0.48:

Hardtail \Hard"tail`\ (h[aum]rd"t[=a]l`), n. (Zool.)
   See Jurel.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jurel \Ju"rel\, n. (Zool.)
   A yellow carangoid fish of the Atlantic and Gulf coasts
   (Caranx chrysos), most abundant southward, where it is
   valued as a food fish; -- called also hardtail, horse
   crevall['e], jack, buffalo jack, skipjack, yellow
   mackerel, and sometimes, improperly, horse mackerel. Other
   species of Caranx (as Caranx fallax) are also sometimes
   called jurel. Juridic