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Longest-Living Octopus Found, Guards Eggs for Record 4.5 Years

If you thought nine months was long, consider watching over your eggs for four and half years—only to die at the end.

A deep-sea octopus, Graneledone boreopacifica, has set a new record for brooding stamina—53 months, the longest developmental period known for any organism, according to a study published July 30 in the journal PLOS ONE.

This female octopus spent four and one half years brooding her eggs on a ledge near the bottom of Monterey Canyon, about 1,400 meters (4,600 feet) below the ocean surface.
This female octopus brooding her eggs on a ledge near the bottom of Monterey Canyon in fall 2007, about seven months after she laid her eggs. Photograph by MBARI

This beats the 14 months on record for an octopus, and really any animal, including the estimated 48 months of gestation in the alpine salamander. Octopuses that live in shallow waters, which are better studied, care for their eggs for only a few months.

What’s more, life spans for nearly all cephalopods—a group containing squid, nautilus, octopus, and cuttlefish—are a short one to two years, which G. boreopacifica outlives by its brooding time alone. Thus, this species also snatches the title of longest lived.

“She’s Still There!”

The discovery comes down to observational luck. In 2007, study leader Bruce Robison was using a robotic vehicle at about 4,500 feet (1,400 meters) deep off the coast of central California. He captured video of a purple octopus crawling toward a rock wall favored by brooding octopuses. (See “Journey of Octopus Discovery Reveals Them to Be Playful, Curious, Smart.”)

A month later, Robison, a deep-sea biologist at the Monterey Bay Aquarium Research Institute, and his team noticed the same female, easily identifiable by distinctive scarring, firmly attached to the rock and protectively curled over her fragile, transparent eggs.

The team returned 18 times over the next 53 months to record the incredibly slow growth of the babies in 37-degree-Fahrenheit (3-degrees-Celsius) water, as well as the gradual wasting away of their motionless mother.

After two years, the consensus was that she wouldn’t last much longer—but she kept proving them wrong. Robison would frequently exclaim, “Holy sh*t, she’s still there!”

Finally, in October 2011, she was gone, and more than 150 eggs lay broken open.

 

Remainders of the octopuses' eggs are still attached to the rock after the young hatched. Photograph by MBARI
Remainders of the octopuses’ eggs are still attached to the rock after the young hatched. Photograph by MBARI

“This is the only opportunity that anybody has ever had to trace a brooding period” of a deep-sea octopus, said Robison. “We had a start date and we couldn’t let go until we got to the end.”

Go, Baby, Go!

Scientists know little about reproduction in the deep sea, but they speculate the octopus’ long development is due to slow metabolism brought on by colder temperatures.

There’s another result to this lengthy incubation: Baby G. boreopacifica are the most highly developed octopus hatchlings known to date, said Janet Voight, associate curator at the Field Museum in Chicago, who wasn’t involved in the research.

Unlike some shallow-water octopuses that have a planktonic stage, G. boreopacifica pop out as small but complete versions of their parents, giving them a greater survival boost in the dark and lonely deep sea.

The mother’s investment in her eggs also means she releases larger, but fewer, eggs—a few hundred versus thousands. (See “Social Octopus Species Shatters Beliefs About Ocean Dwellers.”)

However, this study involved just one animal, which raises the question of whether the egg-rearing stint is an anomaly.

Voight said the lengthy brooding behavior is probably typical for the species. “Of course, more data are better, but it’s the deep sea”—a challenging place to conduct research.

Parental Sacrifice

As with many deep-sea discoveries, another mystery has surfaced: Did this mother octopus not eat for nearly five years? After all, “as a rule, most octopuses never leave their eggs,” said Robison. Voight added that octopuses brooding in warm water don’t eat. (Related: “‘Bizarre’ Octopuses Carry Coconuts as Instant Shelters.”)

No one knows. The study team never witnessed the mother feeding, but they observed only about 18 hours of a 53-month brooding cycle. The scientists even offered her crab, but she didn’t take the bait. Robison surmised she might have occasionally eaten small crabs in defense of her eggs, a theory based on carcasses found close by.

But one thing for sure is that Robison and his team found an invertebrate making the ultimate sacrifice to care for its young.

“We tend to think of parental care only in higher life-forms, but here’s a parent who is going all out to ensure the survival of her offspring.”

Follow Amy West on Twitter.

Comments

  1. Manuel Lukingan
    United States
    August 3, 4:03 pm

    This is a proof that Life is unimaginable. There must be more than this. Amazing!

  2. Adam Jackson
    New Hampshire
    August 3, 10:41 am

    Seeing this animal sacrifice this much time and in the end it’s very own life really puts the daily struggles in human’s lives in perspective. Amazing creature.

  3. jody johnsen
    United States
    August 3, 9:02 am

    Wow! What a great story. If the mother octopus attacked and killed crabs in defense of her eggs then she was aware of the lengthy ordeal for every agonizing minute as opposed to a cold induced lethargy that might have spared her constant awareness.

  4. Ann
    August 3, 8:28 am

    Wow, what a caring mother. But the problem is that the mother octopus hardly even got to see her young after they hatched from their eggs…

  5. Alexandre Beaudry
    August 3, 7:06 am

    Is it possible that she ate some of her eggs in order to survive???

  6. Leonardo M
    Italy
    August 3, 3:41 am

    you should replace the word “theory” with “ipothesis”:

    The scientists even offered her
    crab, but she didn’t take the bait. Robison
    surmised she might have occasionally eaten small crabs in defense of her eggs, a theory
    based on carcasses found close by.

  7. javier
    peru
    July 31, 5:59 pm

    I like this article.Congratulations,

    I’m only a office man (economist). I dont know about octopus

    Only a woman is very sensible about the gestation time .

    javier

  8. Heavenly Moon
    creston middle school indianapolis
    July 31, 1:42 pm

    This is showing that most animals can live longer than expected.

  9. Robyn Tarantino
    Massachusetts, USA
    July 30, 3:20 pm

    “We tend to think of parental care only in higher life-forms”?? I thought it had been established in research a few years ago that the octopus exhibits behavior which makes it equivalent in intelligence to dogs. To me this means that we ought to already consider the octopus to be a “higher life-form”.

  10. Eric
    NYC
    July 30, 2:31 pm

    How do you know that mom died?

  11. Scott deBeaubien
    July 30, 2:30 pm

    Too bad humans kill their offspring in the womb, otherwise we might be known as “The most caring species.”