The area highlighted is the Middle Banks
The Middle banks provides premier pelagic fishing within a time budget. The second line of banks just off the San Diego coastline, you will find Bluefin Tuna, Yellowfin Tuna, Dorado, and Yellowtail lurking in these waters. The most common methods of fishing here is patty hopping. The Captain will look for the patties floating on the water surface, hoping that underneath you will find what you are looking for. Other methods including trolling, kite fishing, balloon fishing, and freelining your bait on the boil.
If you are not looking to go on a 24 hour + trip, but still want to get on the tuna, this is your call.