Slow Down for Whales: How Global Shipping Learned to Share the Ocean

Blue whales can't dodge ships. When scientists tracked blue whales alongside cargo ships off Southern California, the whales responded in just over half the encounters, and every response was the same: a slow, shallow dive. Not once did a whale move sideways out of the ship's path. Models suggest ships kill around 18 blue whales a year off the U.S. West Coast, nearly eight times what the population can lose and still recover.

The good news is in the data. Most blue whale strike deaths happen in a small slice of ocean, and that's where ports, air quality agencies, marine sanctuaries, and shipping lines decided to act. Through the Protecting Blue Whales and Blue Skies program, 787 vessels voluntarily slowed to 10 knots or less across more than 481,000 nautical miles in the 2025 season. Similar slowdowns now run off Vancouver, and whale sighting apps fed by everyday people warn captains when whales are nearby.

This episode wraps up our week on the biggest animals that have ever lived, building on our conversation with Ashley Blawas. You'll hear how one study changed shipping behavior, why voluntary programs work and where they fall short, and how a single sighting from shore can give a whale the time it needs.

Takeaways

• Blue whales respond to approaching ships with slow, shallow dives and never move sideways out of the way
• Ship speed is the variable humans can change; slower ships give whales time to sink below danger
• Point Blue's 2017 model estimated 18 blue, 22 humpback, and 43 fin whales killed by ships each year off the U.S. West Coast
• 74% of modeled blue whale deaths occur in just 10% of the area, so targeted action works
• In 2025, 787 vessels slowed to 10 knots or less across 481,000+ nautical miles off California
• Logging sightings in apps like Whale Alert or Ocean Wise's Whale Report helps warn ships in real time

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