Source : Webster's Revised Unabridged Dictionary (1913)

Matajuelo \Ma`ta*jue"lo\, n. [Cf. Sp. matajud['i]o a kind of
   fish.]
   A large squirrel fish ({Holocentrus ascensionis}) of Florida
   and the West Indies.

Source : WordNet®

Holocentrus ascensionis
     n : bright red fish of West Indies and Bermuda