these look like the same fish in the center of the quilt .. scroll down to post #4 where the author of the patten replied. it's an old post from 2010 ... hope the references are still good.
http://think-quilts.com/2009/04/22/fish-fish-shark/
And another pattern .... looks like she got it from November 2003 "The quilter" magazine.
http://piraterodgers.com/quilting/20...l-of-SLO-fish/
There is a close up of the pattern at the bottom of the second link ... looks easy enough to figure out.