The Collaborative International Dictionary of English v.0.48:

Boarfish \Boar"fish`\, n. (Zool.)
   (a) A Mediterranean fish (Capros aper), of the family
       Caproid[ae]; -- so called from the resemblance of the
       extended lips to a hog's snout.
   (b) An Australian percoid fish (Histiopterus
       recurvirostris), valued as a food fish.
       [1913 Webster]

WordNet (r) 3.0 (2006):

Capros aper
    n 1: fish with a projecting snout [syn: boarfish, Capros
         aper]