Blue Whales and Blue Skies: 2025 vessel speed reduction season reporting

evidence

In the 2025 season 787 vessels across 44 shipping lines voluntarily reduced speed over more than 481,000 nautical miles in designated zones along the California coast; participating vessels reduced fatal strike risk to blue, fin and humpback whales by 40 percent against a 2016 baseline and cut underwater radiated noise acoustic intensity by 70 percent. The programme asks vessels of 300 gross tons or more to slow to 10 knots or less and is being extended statewide under California Assembly Bill 14. V55 verification basis: retrieved in search summary of agency announcements; the underlying analyses were not obtained, and the risk reduction is reported for participating vessels rather than for all traffic.

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