SAN FRANCISCO (CBS/AP) — New safety guidelines have been issued for eating fish caught in San Francisco Bay, the first such update in 17 years.

The California Office of Environmental Health Hazard Assessment is cautioning children and women of childbearing age to steer clear of eating perch, white sturgeon, shark or striped bass caught in the bay.

READ MORE: UPDATE: News Crew Security Guard Shot in Oakland Dies From Injuries; Photo of Suspect Vehicle Released

The fish contain unsafe levels of mercury and PCBs, toxins dangerous to human health, especially for children and pregnant women.

There was good news for striped bass lovers: people 45 and older can safely consume two servings per week. Previous warnings allowed only two servings per month.

READ MORE: Teenage Programmer in East Bay Creates Internet Study-Buddy Platform for Students

The guidelines also warn against eating fish caught in the Lauritzen Channel in Richmond’s inner harbor because of very high levels of DDT, a pesticide now banned in the U.S.

>> Full Report: Guide To Eating San Francisco Bay Fish & Shellfish

MORE NEWS: California Gold Rush Town Typifies Labor-Shortage Plight Vexing Businesses

(Copyright 2011 by CBS San Francisco. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. Wire services may have contributed to this report.)