Study Finds Lasting 60% Marine Life Decline In Gulf Spill Zone
A study in the Proceedings of the National Academy of Sciences, published Monday, found midwater marine life in the Gulf of Mexico's "twilight zone" declined roughly 60% after the 2010 Deepwater Horizon spill.[1]
From 2011 to 2015 researchers recorded a 63.5% fall in midwater fish, a 62% drop in crustaceans, a 59.7% decline in squid and octopus, and a 72% fall in krill.[1] Follow-up sampling through 2023 found populations remained far below 2011 levels, with only slight and statistically weak upticks in 2022-2023.[1]
In 2010 the Deepwater Horizon well blew out, creating the spill near the area researchers studied.[1] Researchers sampled the midwater zone between the surface and about 5,000 feet deep starting in 2011 to track longer-term changes.[1]
The team found no corresponding shifts in temperature, oxygen or food availability but did detect genetic signatures of inbreeding, which supports a link to spill-related mortality and chronic contamination.[1] BP said the accident "forever changed" the company, and outside scientists called the sustained, largely hidden damage "shocking" and relevant to debates over deepwater drilling and deep-sea mining.[1]
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📌 Key Facts
- The study, published Monday, Oct. 19, 2026, in PNAS, analyzed the Gulf of Mexico's midwater "twilight zone" between the surface and about 5,000 feet deep near the 2010 Deepwater Horizon well.
- From 2011 to 2015, midwater fish abundance in the sampled area fell 63.5%, crustaceans declined 62%, larger animals such as squid and octopus dropped 59.7%, and krill fell 72%.
- Follow-up sampling through 2023 found populations remained far below 2011 levels, with only slight, statistically weak upticks in 2022–2023.
- Researchers found no corresponding shifts in temperature, oxygen or food availability but did detect genetic signatures of inbreeding, supporting a link to spill-related mortality and chronic contamination.
- BP spokesperson Paul Takahashi said the accident "forever changed" the company, while outside scientists called the sustained, largely hidden damage "shocking" and relevant to debates on deepwater drilling and deep-sea mining.
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