Search operations continue for Erica Fox after the co-founder of the Kelp Krawlers went missing during a group swim near Pacific Grove on Sunday.Witnesses reported seeing a shark breach the surface with a human body in its mouth shortly before the 55-year-old swimmer disappeared from a group of 17 people.Local authorities closed three beaches through Tuesday as the Coast Guard and police teams resumed efforts to locate the victim in the first such potential fatality in 70 years.