How does one dead whale feed the deep sea for decades?
When a whale dies and sinks, its skeleton can become an oasis for worms, clams and bacteria for as long as a century.
▶ Start the storyA dead whale that sinks to the deep seafloor becomes a feast and then a habitat. Its carcass can create a complex local ecosystem that supplies food to deep-sea organisms for decades. A whale fall is simply a whale carcass on the ocean floor, typically deeper than 1,000 m, and it carries a huge amount of food into a place where food is scarce: a typical 40-tonne carcass holds about two tonnes of carbon, roughly what a hectare of seafloor receives in 100 to 200 years.
2 tonnes
The feast comes in stages. First, mobile scavengers such as and sleeper sharks strip the soft tissue, at up to 40 to 60 kg per day. Then enrichment opportunists move onto the bones and the muddy sediment around them.
The long phase comes later. Whale bones are rich in , which are 4 to 6% of a whale's body weight, and bacteria slowly break them down, producing . That chemical feeds bacteria, which in turn feed mussels, clams and snails. This last digestion stage can last between 50 and possibly 100 years.
The first recorded whale fall was found by US Navy bathyscaphe pilots in the Trieste II on 19 February 1977, and in 1987 a team led by Craig Smith found the first whale fall ecosystem.
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Recap
A sunken whale is a deep-sea feast in stages: scavengers, opportunists, then bone-eating bacteria.
💡 A trick to remember it · Flesh first, bones last: sharks eat the meat, bacteria eat the bones, and mussels live off the bacteria.
Surprising fact · Whale bones can feed bacteria for 50 and possibly 100 years.
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No source, no claim. Every fact in this lesson (18 claims) cites at least one of these.