San Francisco, Calif. (KCBS)  -- Authorities have arrested an owner of a San Francisco restaurant suspected of illegally serving abalone and shipping some of it overseas.

A little after sunrise this morning, officials with the state Department of Fish and Game went to the Visitation Valley home of Bao Zhang, operator of Bob's Sushi, located on the 300 block of Bay Street.

Authorities say Zhang served abalone at his restaurant, and shipped some of it to Hong Kong.

Fish and Game Captain Dave Fox told KCBS' Janice Wright that Zhang allegedly bought abalone from undercover agents and sold it in his restaurant.

"We were able to make sales undercover, he purchased from us readily and we caught him selling it in bulk and shipping it out of the country."

With Zhang now in custody, authorities plan on searching his restaurant Thursday.

The arrest of Zhang comes as part of a statewide crackdown on restaurants suspected of illegally serving and selling abalone and sturgeon.