silversides \sil"versides`\, n. zool.
   any one of several species of small fishes of the family
   atherinidae, having a silvery stripe along each side of the
   body. the common species of the american coast menidia
   notata is very abundant. called also silverside, sand
   smelt, friar, tailor, and tinker.
   1913 webster

   brook silversides zool., a small fresh-water north
      american fish labadesthes sicculus related to the
      marine silversides.
      1913 webster
see also:
atherinidae menidia notata silverside sand smelt friar tailor 
tinker brook silversides labadesthes sicculus