tutorial:
http://cg.tutsplus.com/tutorials/blender/creating-an-animated-fish-swarm-in-blender-using-particles-the-complete-workflow-compositing/
animation:
http://www.youtube.com/watch?v=Eaj6O4_KKeg
you will learn how to use blender internal and cycles in one project, to put motion blur and a nice background...
