This is an oil painting on canvas in shades of blue.  Inspired by a dive trip to the Red Sea in March 2015 where it was common to see massive shoals of Fusileer fish hanging around under the dive boat, plus I was playing with my new GOPRO camera snapping everything that moved!  This measures 24" x 14" and us on a 38mm deep box frame - no need to frame.  It is varnished to protect the oil.