Around 9 a.m. the group that had gone out rock fishing on a recreational fishing boat started taking on water and called the U.S. Coast Guard, Harbormaster Scott Grindy said.
A rescue boat from the nearby Pillar Point Harbor was dispatched out and was able to get all six onto the boat and safely to shore, Grindy said.
No one was injured in the capsizing.
The boat remains this afternoon about 60 feet underwater just outside the harbor, Grindy said.
Some fishing equipment and coolers were salvaged from the sinking boat, he said.
A few portable gas tanks were also removed from the vessel, he said.