Karasugoi
Karasugoi are Koi that are solid black. When buying a Karasugoi, look for one with deep color. Check the fish over for any old scars or bad scales, for these will take away from the look of the Koi.
Karasu or Karasugoi (kah' rah sue or kah' rah sue goy) Means "The crow" or black Nishikigoi with no white.
