This morning I woke up to this email from the Aquarium of the Pacific (I suppose I’d signed up for communications a while back) announcing the death of Ghost, the universe’s best-known and most loved Giant Pacific Octopus (Enteroctopus dofleini):
The Aquarium is saddened by the loss of Ghost, the giant Pacific octopus who was beloved by staff, guests, and those who learned about her online. Ghost died on March 24 after entering senescence, the natural end-of-life process after laying eggs. The Aquarium announced Ghost’s senescence online in September 2025. Ghost was resting behind the scenes while animal care and veterinary staff provided her with extra support and care during her senescence.
Digital image and b-roll of Ghost can be downloaded here through the Aquarium’s Media Library.
For interviews, please call 562-833-1455 or reply to this email.
Best wishes,
Marilyn Padilla / Chelsea Quezada / Andreas Miguel
(562) 951-1684 / (562) 951-3197 / (562) 951-1678
Public Relations
Aquarium of the Pacific
I’ve posted about Ghost several times before, and when she went into senescence, after producing a batch of infertile eggs (there was no male in her tank), they took her off display. I kept watching for a death announcement, but in the absence of one, I assumed she’d crossed the Rainbow Bridge and they were going to keep her death quiet. So I was taken aback by the announcement above because I didn’t think it possible for an octopus to senesce for seven months. But I guess it is possible. I looked it up on Wikipedia, which said this (my bolding):
After reproduction, they enter senescence, which involves obvious changes in behavior and appearance, including a reduced appetite, retraction of skin around the eyes giving them a more pronounced appearance, increased activity in uncoordinated patterns, and white lesions all over the body. While the duration of this stage is variable, it typically lasts about one to two months. Despite active senescence primarily occurring over this period immediately following reproduction, research has shown that changes related to senescence may begin as early as the onset of reproductive behavior. In early stages of senescence, which begins as the octopus enters the stage of reproduction, hyper-sensitivity is noted where individuals overreact to both noxious and non-noxious touch. As they enter late senescence, insensitivity is observed along with the dramatic physical changes described above. Changes in sensitivity to touch are attributed to decreasing cellular density in nerve and epithelial cells as the nervous system degrades. Death is typically attributed to starvation, as the females have stopped hunting in order to protect their eggs; males often spend more time in the open, making them more likely to be preyed upon.
Ghost lived more than three times that long, probably because she was lovingly cared for by the Aquarium staff, as recounted in this story from ABC Eyewitness News 7.,which also confirms the demise of the beloved mollusc:
A beloved octopus at the Aquarium of the Pacific in Long Beach has died, officials announced Wednesday.
The giant Pacific octopus named Ghost died on Tuesday.
Back in September, aquarium officials announced that Ghost laid eggs and entered the last phase of her life cycle, known as senescence. She had been resting behind the scenes while being taken care of by aquarium staff during her senescence.
“We are going to miss her. Ghost left a big impression on us and on so many people, even those beyond our Aquarium,” Nate Jaros, Aquarium of the Pacific vice president of animal care, said in a press release announcing her death. “She was spirited and very charismatic and loved to interact with our animal care staff. She was very engaged with the mazes and puzzles our staff created just for her. Ghost had a preference for interacting with her aquarist caregiver, sometimes preferring these interactions over eating. She was especially inquisitive when our staff members would dive in the habitat for maintenance.”
In her last days, care for Ghost included hand-prepped quality seafood, curated enrichment activities for her mind, and state-of-the art veterinary care.
Although senescence is part of the natural life cycle of a female octopus, aquarium officials noted her passing was a sad time for all.
“We hope part of her legacy is raising awareness about octopuses and inspiring people to care for and protect the ocean,” said Jaros.
Ghost arrived at Aquarium of the Pacific in May 2024 and only weighed about three pounds at the time. She grew to be over 50 pounds and was estimated to have been between two and four years old when she died.
In the wild, giant Pacific octopuses live up to five years. They spend their whole lives alone and only come together briefly to reproduce.
Here’s Ghost being weighed (a hefty 40 pounds) in happier days:
@aquariumpacific Ghost’s weigh-in 🏋️♀️🐙⚖️ #animalcare #octopus #aquariumofthepacific
As a thought exercise, and maybe in a comment, think about why it’s adaptive for a female to waste away unto death when she could start eating and perhaps produce a second brood. Why would evolution favor senescence in a case like this? Notice in the announcement above that she was indeed eating as she approached death, but senescence involves more than just food deprivation: humans senescence and die too, even when they’re eating.
Admirable effort by the aquarium, commendable. A striking story, I’m glad PCC(E) highlighted it – I hesitate to say “sad” – (but of course just did) – but it strikes me as one of these tales that demonstrates drive and commitment (off the top of my head). Dare I say “love”? (Ah – just did again !)
Something to reflect upon.
I don’t have an answer to your question in your final paragraph. However, I would assume it’s similar to salmon and other anadromous fishes that usually (but not always!; e.g. steelhead (Oncorhynchus mykiss)) die after spawning. Apparently there is one vertebrate (a lizard) that dies after breeding (found it: Labord’s chameleon (Furcifer labordi)).
It seems a puzzling behavior but so common you would think it must have adaptive value of some kind.
Sad, but not unexpected. Yeah. Starving yourself to death would seem to be a poor strategy for passing your genes on to the next generation. It would seem that being alive can only be a benefit.
Unless, of course, there are resource limitations. There’s competition (for food, space, resources) between the offspring and parent. Maybe the genes for senescence and death reached fixation because making room for the offspring produces more offspring in the long run (carrying senescence genes to fixation). There’s a lot written about semelparity. Maybe even Robert Trivers had something to say about it. It sounds like something that was up his alley.
If the effects of gene expression are detrimental to survival after procreation they’re less likely to be selected out?
Actually I lean towards Norman’s resource limitation suggestion.
1) Evolution may not favor senescence, it may just be unavoidable happenstance, due to a mutation that broke something important a long time ago. Senescence then death is baked in.
2) Senescence may be a holdover from earlier times of food scarcity that stuck, because babies eat smaller prey that would not sustain an adult.
3) Guarding eggs without leaving them to predate may be much more efficient than not guarding them for survival rates. Given the short lifespans of octopuses, the metabolic sequelae of prolonged starvation are relatively insurmountable since there is no guarantee of a second clutch.
4) It might be simply that guarding eggs for a long time without predating renders a mother octopus so damaged that it can not successfully predate anymore.
5) The survival rate of growing offspring may be improved enough by not having a fully-grown adult competing for food that it offsets the lower probability of a second clutch by the mother.
I was coming down to leave a comment, but you already got across most of the points, especially number 3.
My lay person’s understanding is that senescence tends to be driven mainly by balancing resources for reproducing now vs. resources for surviving to reproduce over multiple mating seasons, under the constraint of when an individual is likely to be dead from other causes, anyway (predation, disease, accidents, etc.). That general consideration is why mice have such short lifespans (they’ll probably be eaten by a snake or an owl or a cat in a few years, anyway), while whales have lifespans in the decades to centuries (not too many natural predators, so better to invest in a long life and be around for multiple mating seasons).
I’d gathered that it’s generally not to make room for the next generation, because the next generation isn’t just your babies, but your neighbors’ babies, as well, and it doesn’t do your genes any good to die to make room for your neighbors’ babies. Though I suppose in particularly resource poor environments, especially when coupled with organisms not likely to survive to the next breeding season, and for r-selected species with a lot of eggs carrying so many copies of a parent’s genes, it may be a benefit for the parent’s genes for the parent to die to leave behind “fertilizer” that will support their own children / remove competition for limited food resources. But I wouldn’t expect that unless all three of those conditions are met (short statistical lifespan, limited resources, r-selected).
RIP Ghost.
Perhaps a second brood would result in genetically weaker offspring so that those octopi who went into senescence after one healthy brood would ultimately pass on more of their genes? A little like children born to aging parents. I don’t know.
I won’t try to add to the ideas about why octopi go into rapid senescence after laying eggs.
But I wonder if it could be prevented while in captivity. Ovulation in insects and humans is under hormonal control, and I suppose it would be the case for mollusks as well. If a kind of birth control could be devised for octopi, preventing ovulation, who knows how long they could live?
Thanks for the update. Sad, but that’s life 😪 The only reason for dying after laying eggs that I can think of is that laying eggs takes so much out of an octopus, that any subsequent offspring may not be as strong as the first set. But then nature could just sterilise an octopus after the first batch and leave it to live a natural life?
I have no idea, but it’s an interesting point to contemplate.
RIP Ghost. You’re a very good Mama Octopus.