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Record Gray Whale Deaths in San Francisco Bay Linked to Ship Collisions

Scientists confirmed blunt force trauma as the leading cause of this year’s Bay Area whale fatalities.

Dead gray whale near the Golden Gate Bridge.  Photo by Marjorie Cox/ The Marine Mammal Center (May 28, 2025)
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Overview

  • Twenty-one gray whale carcasses have been documented in Bay Area waters in 2025, marking the highest annual count since 2000.
  • The July 7 subadult female recovered under Richmond Long Wharf was towed to Angel Island for necropsy, which revealed hemorrhaging consistent with a vessel strike.
  • Researchers identified more than 35 individual gray whales in the bay via photo identification, signaling an unusual surge in local sightings.
  • NOAA estimates place the eastern North Pacific gray whale population at roughly 13,000 individuals, its lowest level since the 1970s.
  • The Marine Mammal Center and conservation partners have issued navigational advisories urging boaters to slow speeds and remain vigilant to prevent further collisions.