The algal bloom in SF is over.Experts fear more fish deaths

Two months after the worst algal bloom in decades began to spread across the San Francisco Bay and eventually killed countless fish, ecologists and water officials are still trying to determine exactly what caused it and how to prevent such a devastating event in the future .

“I don’t think we’ll ever really know what actually triggered it,” said Erin White, executive director of the San Francisco Bay Area Water Quality Control Board, which called for additional monitoring after flowering officially ends. However, this week’s warm weather has her worried that another warmer day could be preceded by cooler weather and shorter days, as there is less sunlight to trigger the blooms.

“Once we get past October, I’m not worried about winter,” White said.

Currently, other parts of California are at risk of algal blooms. Santa Cruz County issued a warning Thursday that the county is experiencing unusually frequent algal blooms due to warmer temperatures and low water levels. The normally clear Lake Tahoe has seen a 300 percent increase in algae over the past year, according to a UC Davis report.

Large-scale algal blooms in the San Francisco Bay began in late July, when red tides began to be noticed in the eastern part of the bay and in Lake Merritt. The algal bloom soon spread across the northern, southern and central bays, and across the San Francisco coastline, killing countless fish, eventually dying on the beaches of Mare Island and near the ferry terminal in Alameda.

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