Seven gray whales have died in San Francisco Bay this year, with several suspected to have been killed by ship strikes, as the marine mammals increasingly detour into the busy waterway in search of food.
The whales, which migrate from Mexico to Alaska, are stopping in the bay to feed due to changing ocean conditions that have reduced their normal prey in the Arctic. Researchers have found evidence of ship strikes in several of the dead whales.
Gray Whale Protection
A coalition of marine scientists and local officials is testing a new system to prevent collisions between ships and whales. The system uses a thermal camera to spot heat from the whales’ exhalations, which are then screened and confirmed by human observers.
The U.S. Coast Guard can use this information to alert vessels and ships to the presence of whales in the area. Gary Reed, director of Vessel Traffic Service San Francisco for the U.S. Coast Guard, says the goal is to raise awareness and prevent encounters between ships and whales.
Gray whales in the North Pacific are declining, with the current population at around 13,000, half of what it was a decade ago. The deaths in San Francisco Bay are part of a larger trend, with 22 gray whales dying in the area last year, the highest number in 25 years.
Conservation Efforts
Researchers are working to determine the cause of death for each whale, with broken bones and bruised tissue often indicating a ship strike. The Marine Mammal Center and the California Academy of Sciences are conducting animal autopsies to assess the impact of human activities on gray whale populations.
Douglas McCauley, director of the Benioff Ocean Science Laboratory at the University of California Santa Barbara, says that every whale that enters and exits the bay matters for the population, and that solving the problem of ship strikes is crucial for conservation efforts.
The decline of gray whales is linked to the shrinking of sea ice in the Arctic, which is altering the ecosystem and reducing the availability of food for the whales. As a result, scientists believe that whales are running out of fuel before they can finish their migration, leading them to search for food in other areas, including San Francisco Bay.
The deaths of gray whales in San Francisco Bay highlight the need for continued conservation efforts to protect these marine mammals and their habitats, and to address the broader impacts of climate change on ocean ecosystems.
