This is part of Abell 1060 (the Hydra Galaxy Cluster). Apparently there are approximately 157 galaxies in the cluster. I'm pretty sure I didn't get them all but there must be well over 100 in this frame which only covers approximately 50 x 38 arcminutes of sky.
This was taken with a Sidereal Trading 10" f/5 carbon fibre Netwonian and ASI1600mm camera (approx 3.6 hours LRGB integration).
A bigger image with a better view of the galaxies is on
Astrobin.