Algae bloom in San Francisco Bay kills fish, threatens swimmers

Alarmingly large numbers of fish have been sighted floating belly up all around San Francisco Bay, prompting environmental groups to suggest that people and their pets stay out of the water to avoid a rare and hazardous algae bloom known as a red tide.Alarmingly large numbers of fish have been sighted floating belly up all around San Francisco Bay, prompting environmental groups to suggest that people and their pets stay out of the water to avoid a rare and hazardous algae bloom known as a red tide.