This Whale Passed Away Many Years Ago. Its Body Is Currently the Most Popular Residence in the Ocean.

When a massive marine mammal, such as a whale, dies, its body sinks to the ocean floor, a process known as a whale fall. Over the next decade or more, a variety of sea creatures feed on the carcass and burrow into its bones, extracting vital nutrients.

Scientists from the Ocean Exploration Trust revisited a whale fall off the coast of British Columbia for the third time in ten years, capturing video of the diverse life still inhabiting the skeleton.

In 2009, researchers from the Monterey Bay Aquarium Research Institute discovered a roughly 16-foot-long gray whale (Eschrichtius robustus) carcass decomposing on the Clayoquot Slope. This phenomenon, the whale fall, plays a crucial role in sustaining creatures in deep ocean regions where food is scarce.

The whale remains rest at the Clayoquot Slope Bullseye, a site monitored by Ocean Networks Canada (ONC) for methane emissions from the seafloor. Subsequent visits in 2012 and 2020 documented the expanding marine community thriving around the skeleton, located approximately 4,100 feet below the surface.

In 2023, ONC and Ocean Exploration Trust's EV Nautilus returned, discovering the skeleton still hosting life nearly 15 years after it first reached the ocean floor. Footage of this remarkable ecosystem was uploaded online.

The expedition report noted that the skeleton supports a diverse benthic community, including invertebrates and a few fish species, such as Cocculina craigsmithi (gastropod), Mitrella (Astyris) permodesta (bucinoid gastropod), Ilyarachna profunda (isopod), Paralomis multispina (crab), Coryphaenoides acrolepis (rattail fish), and Lamellibrachia cf. barhami (tube worms). Some tube worms, likely the same individuals seen in 2009, still inhabit the whale's left jaw bone.

A whale carcass decomposes in three stages: Mobile Scavenger, Enrichment Opportunist, and Sulfophilic. Each stage supports different organisms, providing sequential nourishment. For example, during the Mobile Scavenger stage, eelpouts consume blubber while octopuses benefit from the remains. Later, burrowing creatures arrive during the Enrichment Opportunist stage, and bacteria convert bone lipids into sulfur in the Sulfophilic stage.

The 2023 expedition included photogrammetry surveys, contributing to a detailed dataset that allows marine biologists to understand the full cycle of life supported by whale falls. In the deep ocean, as elsewhere on Earth, death serves as a catalyst for new life, reinforcing the endless cycle of nature.

Author’s Analysis: Life Sustained by a Whale Fall

The recent revisit to the gray whale carcass off British Columbia highlights the long-term ecological significance of whale falls. Nearly 15 years after the whale reached the ocean floor, the skeleton continues to support a complex community of deep-sea organisms, demonstrating how a single carcass can sustain life for over a decade.

Observations confirm that the whale fall hosts a range of invertebrates and fish, including gastropods, crabs, tube worms, and rattail fish. Notably, some tube worms may be the same individuals recorded in 2009, emphasizing the stability and persistence of this micro-ecosystem.

Scientific monitoring through ONC and EV Nautilus expeditions has provided detailed photogrammetry and video data, allowing researchers to track changes over time. The whale fall illustrates all three stages of decomposition—Mobile Scavenger, Enrichment Opportunist, and Sulfophilic—each supporting distinct organisms and nutrient cycles.

These findings reinforce the critical role of whale falls in deep-sea ecology, providing insights into how nutrient-rich carcasses drive biodiversity in otherwise food-limited environments. The continuous observation of this site offers an invaluable window into the processes that sustain life in the deep ocean.

Sources:

• This Whale Died Decades Ago. Its Carcass Is Now the Ocean’s Hottest Housing Complex.