The Collaborative International Dictionary of English v.0.48:

Matajuelo \Ma`ta*jue"lo\ (m[aum]`t[.a]*hw[=a]"l[=o]; 239), n.
   [Cf. Sp. matajud['i]o a kind of fish.]
   A large squirrel fish (Holocentrus ascensionis) of Florida
   and the West Indies.
   [Webster 1913 Suppl.]