A mother and her calf were spotted as far north as the Pittsburg Marina a couple of weeks later — the second-farthest upriver sighting documented in the Bay Area.
A harbor porpoise recently found its way far from home, appearing in a Bay Area waterway where the species had previously never been seen before.
On Sept. 14, the lone cetacean was spotted swimming in the Petaluma River near the yacht club with its dorsal fin just visible above the surface of the water. Customers at the nearby Grand Central café gathered outside to try to figure out what it was, as Petaluma 360 first“They wanted to make sure it wasn’t a shark, or something else,” Bill Keener, a field researcher with the center who specializes in harbor porpoises, told SFGATE on Thursday.
On any given day, hundreds of harbor porpoises could be swimming in the San Francisco Bay, but that wasn’t always the case. The species abandoned their home near the Golden Gate Bridge at the start of World War II as large ships, submarine nets, and hundreds of underwater mines inundated and polluted the bay. Decades later, after the Clean Water Act was passed in 1972 and water quality gradually improved, harbor porpoises began to return to the bay in the 1990s.
It was around that time that Keener observed the marine mammals exploring beyond their usual range. One was spotted
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