Police Lieutenant James Knox said 450 people were inside the club when the altercation started and that many refused police orders to break up the fight, moving instead outside the club to continue fighting.
"As the patrons from the club were exiting and milling into the parking lot, the fights continued," Knox said.
Told that one of the patrons was lying in the ground near Kinder's Restaurant, Knox said police found a 23-year-old black male from Fremont lying on the ground with an apparent gunshot wound to his leg.
"He also sustained an injury to his head (and) was taken to Eden Hospital in Castro Valley by ambulance," Knox said. "The victim is in stable condition and his wounds are non-life threatening."
Officers on scene interviewed security personnel and witnesses in the area but no suspect has been identified. Anyone who saw the crime or has information pertinent to this investigation is asked to call the Pleasanton Police Department at 931-5100.