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Nutritional stress and warming seas threaten Hawaiʻi's last false killer whales
https://www.soest.hawaii.edu/soestwp/announce/news/threats-last-false-killer-whales/Posted on June 4, 2026 by Marcie Grabowski
A false killer whale suspended above the water, after launching its prey high into the air. Credit: Pacific Whale Foundation.
A seven-year collaborative study has revealed alarming fluctuations in the health of Hawaiʻi’s endangered insular false killer whales, with some individuals losing nearly a quarter of their body weight in just a few months. Published today in Endangered Species Research, the findings provide the first quantitative evidence that nutritional stress and environmental shifts may be driving the decline of this iconic population, which now numbers fewer than 140 individuals.
The research—a partnership between the Pacific Whale Foundation (PWF), the Marine Mammal Research Program (MMRP) at UH Mānoa Hawaiʻi Institute of Marine Biology, and the Okinawa Churashima Foundation—utilized high-resolution drone photogrammetry to track 68 whales (roughly half the remaining population) between 2019 and 2025.
…
A cultural and ecological loss
The whales found in Hawaiʻi are a distinct, island-resident population adapted to the region’s coastal ecosystems and dependent on these waters for survival. They represent one of the smallest and most endangered whale populations in the United States, where the loss of even a few animals can have consequences for the entire population.
The loss of these apex predators resonates beyond biology. “Hawaiian culture has been losing many kūpuna, elders who carry the libraries of knowledge in cultural practices,” shares Kaʻapuni, Cultural Advisor at PWF. “Losing our native population of false killer whales removes even more knowledge from our islands and our history. We cannot afford to lose any more pieces of Hawaiʻi.”
…
Currie JJ, Stirling B, Olson G, van Aswegen M, Evans L, Stack SH, Kobayashi N, Ueda K, Higa S, Gough W, Vivier F, McPherson L, Fertitta K, Bejder L (2026) Body condition differs among social clusters and across years in endangered false killer whales in Hawai‘i. Endang Species Res 60:esr01505 https://doi.org/10.3354/esr01505A false killer whale suspended above the water, after launching its prey high into the air. Credit: Pacific Whale Foundation.
A seven-year collaborative study has revealed alarming fluctuations in the health of Hawaiʻi’s endangered insular false killer whales, with some individuals losing nearly a quarter of their body weight in just a few months. Published today in Endangered Species Research, the findings provide the first quantitative evidence that nutritional stress and environmental shifts may be driving the decline of this iconic population, which now numbers fewer than 140 individuals.
The research—a partnership between the Pacific Whale Foundation (PWF), the Marine Mammal Research Program (MMRP) at UH Mānoa Hawaiʻi Institute of Marine Biology, and the Okinawa Churashima Foundation—utilized high-resolution drone photogrammetry to track 68 whales (roughly half the remaining population) between 2019 and 2025.
…
A cultural and ecological loss
The whales found in Hawaiʻi are a distinct, island-resident population adapted to the region’s coastal ecosystems and dependent on these waters for survival. They represent one of the smallest and most endangered whale populations in the United States, where the loss of even a few animals can have consequences for the entire population.
The loss of these apex predators resonates beyond biology. “Hawaiian culture has been losing many kūpuna, elders who carry the libraries of knowledge in cultural practices,” shares Kaʻapuni, Cultural Advisor at PWF. “Losing our native population of false killer whales removes even more knowledge from our islands and our history. We cannot afford to lose any more pieces of Hawaiʻi.”
…