Turning the red tide: As toxic algae bloom begins retreat, more fish may be doomed

While what is being called a massive harmful algal bloom stretching across San Francisco Bay appears to now be in decline, state and regional water resource officials say depleted oxygen levels caused by the algae could lead to large-scale aquatic deaths in the days ahead.

That is the warning, according to the California Water Resources Control Board, the San Francisco Regional Water Quality Control Board and the California Department of Fish and Wildlife.