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Sharks Moving Closer to Shore, Whales Abandoning Feeding Grounds: What Is Happening to the Pacific Ocean?

Christy Bowen

2 hours ago
An aerial photograph of a blue whale gliding through the deep blue waters of the Pacific Ocean, where an El Niño-driven marine heat wave is threatening the krill populations the world's largest animal depends on for survival. Scientists warn that warming waters forecast to persist off Southern California through August 2026 may force blue whales to abandon traditional feeding grounds in search of adequate food supply.
A blue whale moves through the Pacific Ocean, where warming waters driven by a marine heat wave are threatening the krill populations the world's largest animal depends on to survive. (Adobe Stock)

The impacts of El Niño go far beyond the weather patterns expected across the U.S. in the coming months. The onset of this climate phase is also expected to trigger marine heat waves capable of threatening the critters that call the Pacific Ocean home. Read on for more information about this concern and what it may mean for marine life in the Pacific.

Marine Heat Wave Already Impacting Sea Life in the Pacific

Marine experts are growing increasingly concerned that the impacts of El Niño could impact the sea life that lives throughout the waters of the Pacific Ocean, including mammals as large as whales, birds, and more. The warming water temperatures in the equatorial Pacific define the El Niño climate phase. It makes sense to learn that the warmer temperatures in this part of the world's oceans naturally disrupt fragile marine ecosystems, putting marine life at risk.

NOAA Physical Sciences Laboratory weekly sea surface temperature anomaly map for June 14–20, 2026, showing dramatically above-normal ocean temperatures across nearly the entire Pacific basin relative to the 1991–2020 baseline. The deep red tongue of anomalously warm water running along the equatorial Pacific directly toward the California coastline represents the El Niño signature driving the marine heat wave currently threatening species from sea lions and seabirds to blue whales and kelp forests along the Pacific coast.
NOAA's weekly sea surface temperature anomaly map for June 14–20, 2026 shows the deep red signature of El Niño warming running across the equatorial Pacific toward the California coast, driving the marine heat wave threatening Pacific Ocean life. (NOAA)

Experts from the Aquarium of the Pacific and the National Oceanic and Atmospheric Administration (NOAA) spoke with the media earlier in the month, detailing how the warmer ocean waters and the resulting El Niño could deliver significant consequences for the marine life that lives off the coast of Southern California. 

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marine heat waveimpacts of el nino on marine liferisks of warmer ocean waters to sea life

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