AI whale detection system launches in San Francisco Bay to prevent gray whale ship strikes

AI-Powered Whale Detection System Launches to Combat Rising Deaths

San Francisco Bay has activated an AI-powered whale detection system designed to prevent ship strikes with gray whales, addressing a crisis that claimed 21 whale lives in 2025—the highest number in 25 years3

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. The WhaleSpotter system, which officially launched on May 19, combines thermal cameras with artificial intelligence to scan the bay around the clock for whale blows and heat signatures up to 2 nautical miles away4

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. At least 40% of last year's gray whale deaths resulted from ship strikes, and at least 10 more whales have died in the Bay Area so far this year2

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Developed by WhaleSpotter, a company based in Somerville, Massachusetts, the technology originated from 15 years of research at the Woods Hole Oceanographic Institution2

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. The system uses thermal cameras that detect temperature differences of about 2 degrees Celsius between whale spouts or bodies and the ambient water2

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. When whales surface for breath, they expel jets of air hotter than their surroundings—signatures the AI model was trained to recognize using hundreds of thousands of thermal images1

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Real-Time Mariner Alerts Transform Marine Traffic Safety

The San Francisco Bay network represents the first system to directly integrate land-based and vessel-mounted detections with official mariner alerts, allowing whale sightings to be relayed in near-real time to ships navigating the bay3

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. Once AI whale detection flags a potential sighting, trained marine mammal observers verify the data to minimize false positives before alerts are sent via radio to ferry operators and vessel traffic controllers4

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. The information is also posted publicly on the Whale Safe website4

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Thomas Hall, director of operations for San Francisco Bay Ferry, explained that the system allows mariners to "make adjustments way before they get anywhere close" and enables tracking data over time to identify where whales congregate, allowing route adjustments during whale season3

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. One camera mounted on a Coast Guard tower at Angel Island's Blunt Point captures images covering a cone of water extending approximately 7 kilometers1

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. A second camera will soon be installed aboard a ferry traveling between San Francisco and Vallejo, creating what researchers describe as a "moving data collection platform"4

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Climate Change Drives Gray Whales Into Deadly Shipping Lanes

Gray whales are making an unprecedented detour into San Francisco Bay during their roughly 12,000-mile migration between breeding lagoons in Mexico and feeding grounds in the Arctic3

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. Since 2018, over 100 gray whales have diverted into the bay on their journey north—a new stop on whale migration patterns that scientists attribute to climate change1

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. Record-low sea ice levels are decimating the algae that fertilize the Arctic food chain gray whales rely on, leaving them unable to eat enough to sustain their entire migration1

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The whales now concentrate in a high-traffic corridor between Angel Island, Alcatraz, and Treasure Island, directly overlapping with ferry routes and shipping lanes3

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. "It's the worst place possible in terms of all the ship traffic," said Rachel Rhodes, a project scientist at the Benioff Ocean Science Laboratory who led the initiative4

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. Food scarcity means whales arrive malnourished and linger for days or even weeks inside the crowded estuary searching for sustenance2

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Declining Population Faces Uncertain Future Despite Conservation Efforts

The eastern North Pacific gray whale population has plummeted by half over the last 10 years, with just 13,000 remaining—a stark reversal from the conservation success story that led to their removal from the Endangered Species Act in 19944

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. Scientists estimate an 18 percent mortality rate for gray whales that enter San Francisco Bay, with seven deaths recorded in the bay so far in 20261

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. Many whale carcasses sink or are swept back out to sea before being found, meaning these figures likely underestimate the true toll3

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WhaleSpotter systems already operate on eight container ships owned by Honolulu-based Matson and on vessels and fixed installations in the United States, Canada, and Australia1

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. The company claims the technology reduces the risk of ship strikes by 90 percent1

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. During its first week and a half of operation, the San Francisco Bay system logged 6,600 whale detections, which scientists believe may represent just a few whales remaining in front of the cameras1

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. Douglas McCauley, director of the Benioff Ocean Science Laboratory, noted that the immediate flood of detections revealed the extent of whale activity: "Suddenly to have a full sense of how much whale activity is in this space honestly put me a little bit on edge"3

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. Researchers plan to expand coverage with additional cameras on the Golden Gate Bridge and Alcatraz, while the system's continuous monitoring capability—operating through night and fog—offers advantages human observers cannot match4

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