The Collaborative International Dictionary of English v.0.48:

Matajuelo blanco \Ma`ta*jue"lo blan"co\
   (m[aum]`t[.a]*hw[=a]"l[=o] bl[aum][ng]"k[=o]). [Sp. blanco
   white.]
   A West Indian food fish (Malacanthus plumieri) related to
   the tilefish.
   [Webster 1913 Suppl.]