San Francisco Bay has deployed an artificial intelligence-powered whale detection network called WhaleSpotter to monitor marine traffic and reduce costly ship collisions with whales—a market-driven solution to an escalating wildlife management challenge driven by climate-induced environmental shifts.
The system, launched this week, scans the water around the clock for whale blows and heat signatures up to 2 nautical miles away and alerts mariners in real time so ships can slow down or reroute when whales are nearby. The effort reflects a pragmatic approach to balancing commercial maritime operations with wildlife protection without imposing broad regulatory restrictions on Bay shipping.
The Problem: Rising Collision Costs
The urgency is clear. Last year, 21 dead gray whales were found in the wider Bay Area, the highest number in 25 years, according to The Marine Mammal Center, and at least 40% were killed by ship strikes. At least 10 more have died in the Bay Area so far this year. Scientists noted those figures likely underestimate the true toll because many whale carcasses sink or are swept back out to sea before they are found or reported.
The root cause reflects broader environmental pressures beyond direct human control. Gray whales migrate along the California coast on a roughly 12,000-mile journey between breeding lagoons in Mexico and feeding grounds in the Arctic. Increasing numbers are now diverting into San Francisco Bay and lingering for days or weeks inside the crowded estuary—a shift scientists increasingly link to climate change. Warming temperatures and shifts in sea ice in the Arctic are disrupting the food web gray whales rely on during summer feeding months, according to a 2023 study in Science, leaving many malnourished during migration.
Many whales now concentrate in a high-traffic corridor between Angel Island, Alcatraz and Treasure Island, directly overlapping with ferry routes and shipping lanes. Rachel Rhodes, a project scientist at the Benioff Ocean Science Laboratory who led the initiative, said the overlap creates "the worst place possible in terms of all the ship traffic." She noted that stranding response teams "ran out of places to even land dead whales."
How the Technology Works
The WhaleSpotter system represents a market-friendly technological solution. Artificial intelligence automatically flags potential whale sightings, which are then verified by trained marine mammal observers before alerts are sent by radio to ferry operators and vessel traffic controllers and posted publicly on the Whale Safe website. Researchers noted the San Francisco Bay network is the first 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 bay.
Thomas Hall, director of operations for San Francisco Bay Ferry, highlighted the operational benefits: "They'll be able to make adjustments way before they get anywhere close." He added, "It will also allow us to track data over time and see where the whales are camping out so we can adjust our routes during whale season to avoid those areas completely."
The first hours of testing produced an immediate flood of detections. Douglas McCauley, director of the Benioff lab, said, "Suddenly to have a full sense of how much whale activity is in this space honestly put me a little bit on edge," and added, "But we're going to use that data and we're going to be smart about how we use that space and share it with the whales."
Researchers noted the system's biggest advantage is constant monitoring because thermal cameras can operate through the night and in many foggy conditions common in the bay. One camera was installed on Angel Island and a second will soon be fixed aboard a ferry traveling between downtown San Francisco and Vallejo to create what Rhodes described as a "moving data collection platform." Scientists hope additional cameras on the Golden Gate Bridge and Alcatraz could eventually expand coverage across the bay.
Broader Conservation Context
The whale population crisis underscores the limits of past regulatory approaches. The eastern North Pacific gray whale population was once hailed as a conservation success story after rebounding from commercial whaling and being removed from the Endangered Species Act 32 years ago. But numbers have since plummeted, decreasing by half over the last 10 years, according to the National Oceanic and Atmospheric Administration. Just 13,000 remain.
Rhodes explained the underlying ecological stress: "They may not be getting the quality or quantity of food they're used to in the Arctic. That means they're starting this incredibly long migration at a disadvantage."
Beyond ship strikes, whales face additional hazards from fishing operations. A severe marine heat wave lingering off the California coast is shrinking the band of cold, nutrient-rich water where krill, anchovies and sardines thrive. As offshore waters warm, humpback whales are increasingly following that prey closer to shore, where California's Dungeness crab fishery operates. The fishery uses tens of thousands of vertical lines that connect traps on the seafloor to surface buoys, creating entanglement hazards for whales.
Regulators have increasingly closed parts of the fishery off central California to conventional gear—a measure that has become more common as warming waters increase whale overlap with crab fishing seasons. Kathi George, director of cetacean conservation biology at The Marine Mammal Center, explained the danger: "Humpbacks are curious and they'll scratch their backs on the gear. If they get a line caught on their body, they'll breach and they'll roll and end up entangling themselves." Whales can drag heavy gear for months, unable to dive or feed properly, leading to starvation, infection and drowning.
Thirty-six whales were confirmed entangled off the West Coast in 2024, the highest number since 2018, according to NOAA, though scientists cautioned most cases go undocumented.
Market-Based Solutions Over Mandates
California approved commercial use of ropeless pop-up crab fishing gear for the first time this spring, allowing fishermen to continue harvesting through the end of the season. Instead of floating surface buoys tethered to traps, the system stores ropes and buoys on the seafloor until fishermen return and trigger an acoustic release that brings the gear to the surface. The innovation demonstrates how technological advancement—rather than fishing bans—can address wildlife concerns while preserving economic activity.
Caitlynn Birch, Oceana's Pacific campaign manager and a marine scientist, framed the adaptive approach: "We will have to continue to be adaptive and science driven in terms of our management to reduce wildlife risk and keep fishermen on the water." She added, "California has been a national leader in developing whale-safe fishing technologies and we hope that model can help guide other fisheries on the West Coast and nationally."
Why This Matters:
The WhaleSpotter deployment reflects a pragmatic, technology-forward approach to environmental challenges without imposing sweeping restrictions on maritime commerce or fishing industries. Rather than broad regulatory closures, the system enables real-time data sharing that allows operators to adjust behavior voluntarily. As climate change continues reshaping ocean conditions and whale migration patterns, scientists expect the overlap between whales, ships and fishing gear to persist. The San Francisco Bay model—combining AI monitoring, voluntary compliance, and market-driven alternatives like ropeless fishing gear—offers a template for managing wildlife protection while maintaining economic productivity. This approach preserves individual decision-making by vessel operators and fishermen while providing them the information needed to coexist with marine life, avoiding the fiscal and operational costs of broader government mandates.