natural occurrence

Dead fish in San Francisco area blamed on toxic red tide

Dead fish in San Francisco area blamed on toxic red tide

“We normally have algae blooms during the summertime. But what’s unusual about this one is how large it is and the fact that there are fish kills,” White said. Most algae blooms end after a week or so. But a triple-digit heat wave forecast for the holiday weekend may help the Bay Area's grow even more, White said. She said that reports of dead fish started coming in last week.

Low water levels, erosion lead to stagnant water in Peche Island canals

Low water levels, erosion lead to stagnant water in Peche Island canals

A natural phenomenon at Peche Island has created a buildup of sediment that is disrupting water flow — affecting some wildlife and frequent users of the city-owned park. Low water levels and sediment in the area, which is likely the result of erosion, have created a "barrier beach" and cut off the channel that pushes water into the island's canals, according to Dan Krutsch. This barrier has caused the water in the island to become more still than usual, he said.