The Collaborative International Dictionary of English v.0.48:

Sandfish \Sand"fish`\, n. (Zool.)
   A small marine fish of the Pacific coast of North America
   (Trichodon trichodon) which buries itself in the sand.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sandfish
    n 1: either of two small silvery scaleless fishes of the
         northern Pacific that burrow into sand
    2: fish of sandy areas of western Pacific and Indian oceans
       having an angular snout for burrowing into sand [syn: beaked
       salmon, sandfish, Gonorhynchus gonorhynchus]