The bottlenose dolphin with a unique dalmatian pattern was first spotted in the Dana Point area in 2006.
Patches appeared again during a July 23 outing on one of Captain Dave's Dolphin and Whale Watching Safari trips. It had been nine months since his last appearance.
Most bottlenose dolphins are light to medium gray on top, with white or pinkish tones on their belly.
Experts believe Patches has leucism - a condition that causes partial loss of pigmentation.