Actually shark researchers have been observing Great Whites returning to the Farallon Islands about 35 miles west of the Golden Gate for over 20 years. This website doesn't talk about migration and return, but Susan Casey's book The Devil's Teeth does discuss how the researchers on the island saw many of the same sharks returning year after year.
The surprising things in the research (as opposed to the article) are the genetic distinction of the Hawaii-California sharks versus sharks in the Western Pacific, and to a lesser extent the fact that sharks habitually come close to shore but rarely interact with humans.
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