According to various articles, dtd 4 March 2011 (see Note 1: and other sources listed by Google - including CBS News) -
scientists (quote) "Looking for signs of ancient human settlement, they unearthed meticulously-crafted spearheads and other tools (see photo at right) that date back 12,000 years and provide insight into the lives of a seafaring culture that obtained bounty from the ocean. The astonishing discoveries, at three sites on Santa Rosa and San Miguel islands west of Santa Barbara .." etc.
Seems they have no idea who might have fished there:
But if someone could spare the bus fare we could have these "scientists" visit the Santa Barbara Museum of Natural History (Note 2) where they could learn about the Chumash who came to the SW California shores 13,000 years ago and who fished around the off shore islands! (Note 3)
PLEASE NOTE:
Known Chumash sites (stated on the Museum website) are on Santa Rosa Island (Arlington Springs 13,000 BP), and an Miguel Island/
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/ NOTES
1.) http://www.grindtv.com/outdoor/blog/24870/scientists+amazing+california+discovery
2.) http://www.sbnature.org/research/anthro/chumash/index.htm
3.) http://www.sbnature.org/research/anthro/chumash/timel.htm