Two branches of the Humane Society are now offering a $2,500 reward for information leading to the arrest and conviction of the person or persons who shot the sea lion.
A beachgoer discovered him in Sausalito in early December suffering from a gunshot wound to the head.
Marine Mammal rescuers named the sea lion Silent Night --he's now blind in his right eye and will not be able to return to the wild.
Anyone with information about this case is asked to call the NOAA 24 hour enforcement hotline at 1-800-853-1964 or NOAA Special Agent Nicholas Call at (707) 575-6075, or NOAA Special Agent Dan Torquemada at (707) 575-6072. Callers may remain anonymous.