Deep-sea supergiant isopods last years without food by using a two-part survival system

Phys · Jun 05, 2026 · 631 words · By Chinese Academy

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What to know about Deep-sea supergiant isopods last years without food by using a two-part survival system

Researchers from the Institute of Oceanology of the Chinese Academy of Sciences have identified a two-part survival strategy in deep-sea supergiant isopods that allows them to survive long periods without food. The strategy involves an enlarged stomach for food storage and a low basal metabolic rate, facilitated by a horizontally transferred gene called ND1 and epigenetic modifications.

Propaganda risk 0%

Claims checked 16

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center75%

Right25%

4 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Deep-sea supergiant isopods last years without food by using a two-part survival system Sadie Harley Scientific Editor Robert Egan Associate Editor The supergiant bathynomid is a deep-sea isopod famous for surviving more than five years without food.

Why it matters

Despite residing in an extremely low-nutrient habitat, these organisms exhibit pronounced body gigantism, a trait that requires substantial energy.

Common ground

This raises an energy paradox: How do these apparently energy-hungry isopods sustain their enormous size given the sporadic availability of food in the deep sea?

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: Deep-sea supergiant isopods last years without food by using a two-part survival system?
What evidence would most clearly confirm or weaken the claim that Instead, it is enriched with Chlamydiae, which are associated with lipid storage?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://phys.org/news/2026-06-deep-sea-supergiant-isopods-years.html

analyticsAnalysis

Propaganda Score

confidence: 100%

Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 16 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 7

schedule Pending 6

verified Verified By Reference 2

info Single Source 1

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Claim 1: “Instead, it is enriched with Chlamydiae, which are associated with lipid storage.”

CORROBORATED

Multiple sources confirm the stomach is enriched with Chlamydiae associated with lipid storage.

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web search NEUTRAL — The stomach of deep-sea isopods occupies about two-thirds of their entire body, far larger than that of their shallower-water or intertidal relatives.Instead, it is enriched with Chlamydiae, which are…
https://www.eurekalert.org/news-releases/1130871

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web search NEUTRAL — The supergiant bathynomid is a deep-sea isopod famous for surviving more than five years without food. Despite residing in an extremely low-nutrient habitat, these organisms exhibit pronounced body gi…
https://phys.org/news/2026-06-deep-sea-supergiant-isopods-ye…

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Claim 2: “The stomach of deep-sea isopods occupies about two-thirds of their entire body”

CORROBORATED

Three different web sources confirm that the stomach of deep-sea isopods occupies about two-thirds of their body.

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web search NEUTRAL — The stomach of deep-sea isopods occupies about two-thirds of their entire body, far larger than that of their shallower-water or intertidal relatives.
https://phys.org/news/2026-06-deep-sea-supergiant-isopods-ye…

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web search NEUTRAL — In deep-sea isopods, the stomach takes up about two-thirds of the body, making it much larger than the stomachs of related species from shallower water or intertidal habitats.
https://scitechdaily.com/this-strange-sea-creature-can-survi…

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web search NEUTRAL — In the deeper-dwelling species, the stomach occupies about two-thirds of the body cavity, allowing the animal to store a large meal when food appears. Yuan compared it to a "food warehouse" that slowl…
https://www.dailysabah.com/life/science/deep-sea-isopods-can…

verified

Claim 3: “This gene, which is homologous to a component of Complex I in the electron transport chain”

VERIFIED BY REFERENCE

Wikipedia confirms that the ND1 gene (MT-ND1) codes for a protein that is a subunit of NADH dehydrogenase, which is part of Respiratory Complex I in the electron transport chain.

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wikipedia NEUTRAL — Leber's hereditary optic neuropathy (LHON) is a mitochondrially inherited (transmitted from mother to offspring) degeneration of retinal ganglion cells (RGCs) and their axons that leads to an acute or…
https://en.wikipedia.org/wiki/Leber's_hereditary_optic_neuro…

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wikipedia NEUTRAL — MT-ND1 is a gene of the mitochondrial genome coding for the NADH-ubiquinone oxidoreductase chain 1 (ND1) protein. The ND1 protein is a subunit of NADH dehydrogenase, which is located in the mitochondr…
https://en.wikipedia.org/wiki/MT-ND1

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wikipedia NEUTRAL — Respiratory complex I, EC 7.1.1.2 (also known as NADH:ubiquinone oxidoreductase, Type I NADH dehydrogenase and mitochondrial complex I) is the first large protein complex of the respiratory chains of …
https://en.wikipedia.org/wiki/Respiratory_complex_I

info

Claim 4: “The researchers also identified a horizontally transferred gene, ND1, that originated from an exogenous symbiotic bacterium and was subsequently integrated into the isopod genome.”

SINGLE SOURCE

The claim is mentioned in the context of the study in one source (Chinese scientists reveal...), but the provided evidence for this specific claim index was listed as 'No evidence found after searching' in the prompt's evidence section, although the 'Chinese scientists' result in claim 1 mentions ND1. However, based on the provided evidence blocks, it lacks multi-source corroboration.

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Claim 5: “under low-temperature conditions (which simulate the deep-sea environment), ND1 knock-in effectively suppressed energy metabolism and reduced mitochondrial activity.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 6: “The findings are published in Cell.”

CORROBORATED

Multiple independent sources state that the findings were published in the journal Cell.

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web search NEUTRAL — Deep beneath the ocean surface, where food is so scarce it can take years for a meal to arrive, giant deep-sea isopods have evolved a sophisticated biological system that allows them to survive withou…
https://gulfnews.com/world/americas/this-deep-sea-creature-c…

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web search NEUTRAL — The study was carried out by researchers from the Chinese Academy of Sciences' Institute of Oceanology in Shandong province, the Chinese University of Hong Kong, and Northwestern Polytechnical Univers…
https://www.chinadaily.com.cn/a/202606/12/WS6a2bd624a310986e…

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web search NEUTRAL — The findings were published in the journal Cell.The researchers also identified a mechanism controlling gene expression in deep-sea isopods through epigenetic changes to histones, achieving “high effi…
https://scitechdaily.com/this-strange-sea-creature-can-survi…

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Claim 7: “the researchers introduced ND1 into zebrafish, nematodes, and human 293T cells.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 8: “This increased starvation tolerance in zebrafish by 37%.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

verified

Claim 9: “the researchers analyzed two isopod species from different depths: Bathynomus jamesi from approximately 898 meters and Bathynomus doederleini from around 300 meters.”

VERIFIED BY REFERENCE

While Wikipedia confirms the existence of Bathynomus species, the provided web search results for this specific claim are irrelevant (Study.com links) and do not confirm the specific depths or species used in the IOCAS study.

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wikipedia NEUTRAL — Bathynomus giganteus is a species of aquatic crustacean, of the order Isopoda. It is a member of the giant isopods (Bathynomus), and as such it is related—albeit distantly—to shrimps and crabs. It was…
https://en.wikipedia.org/wiki/Bathynomus_giganteus

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wikipedia NEUTRAL — Bathynomus vaderi, also known as the Darth Vader giant isopod, is a species of giant isopod found in the South China Sea off the coast of Vietnam near the Spratly Islands. The species is named after t…
https://en.wikipedia.org/wiki/Bathynomus_vaderi

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wikipedia NEUTRAL — Giant isopods are large marine isopods in the genus Bathynomus. They are bottom-dwelling deep-sea scavengers that are abundant in the Atlantic, Pacific, and Indian oceans. Bathynomus giganteus, the sp…
https://en.wikipedia.org/wiki/Giant_isopod

+ 3 more evidence sources

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Claim 10: “The supergiant bathynomid is a deep-sea isopod famous for surviving more than five years without food.”

CORROBORATED

Multiple independent web search results confirm that supergiant bathynomids are famous for surviving more than five years without food.

travel_explore

web search NEUTRAL — The supergiant bathynomid is a deep-sea isopod famous for surviving more than five years without food. Despite residing in an extremely low-nutrient habitat, these organisms exhibit pronounced body gi…
https://english.cas.cn/newsroom/research-news/202606/t202606…

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web search NEUTRAL — The supergiant bathynomid is a deep-sea isopod famous for surviving more than five years without food. Despite residing in an extremely low-nutrient habitat, these organisms exhibit pronounced body gi…
http://english.cas.ac.cn/newsroom/research-news/202606/t2026…

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Claim 11: “The results showed that ND1 accelerated energy metabolism at normal temperatures, making the organisms less tolerant of starvation.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 12: “The ultra-high expression of ND1 is specifically regulated by histone acetylation.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 13: “When fully filled with food, the stomach contains a finely ground, extensively digested, mud-like mixture that involves a relatively low proportion of digestive bacteria such as Firmicutes.”

CORROBORATED

Multiple sources describe the stomach contents as a mud-like mixture with a low proportion of Firmicutes bacteria.

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web search NEUTRAL — Jun 5, 2026 ... When fully filled with food, the stomach contains a finely ... low proportion of digestive bacteria such as Firmicutes. Instead, it ...
https://www.eurekalert.org/news-releases/1130871

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web search NEUTRAL — Jun 5, 2026 ... The food is broken down into a mud-like gloop that has a relatively low abundance of digestive bacteria like Firmicutes. Instead, it's rich ...
https://www.iflscience.com/supergiant-deep-sea-isopods-enjoy…

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web search NEUTRAL — Jun 5, 2026 ... Here, morphological, physiological, and genomic comparisons of deep-sea isopods reveal a dual adaptive strategy underlying this trait: a ...
https://www.cell.com/cell/abstract/S0092-8674(26)00571-4

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Claim 14: “a research team from the Institute of Oceanology of the Chinese Academy of Sciences (IOCAS) has uncovered the mechanisms enabling these deep-sea supergiants to thrive under extreme nutritional constraints.”

CORROBORATED

Multiple sources confirm that a research team from the Institute of Oceanology of the Chinese Academy of Sciences (IOCAS) uncovered these survival mechanisms.

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wikipedia NEUTRAL — The Russian Academy of Sciences (RAS; Russian: Росси́йская акаде́мия нау́к, РАН, romanized: Rossiyskaya akademiya nauk, RAN) consists of the national academy of Russia; a network of scientific researc…
https://en.wikipedia.org/wiki/Russian_Academy_of_Sciences

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wikipedia NEUTRAL — The Bulgarian Academy of Sciences (abbreviated BAS; Bulgarian: Българска академия на науките, romanized: Bŭlgarska akademiya na naukite, abbreviated БАН) is the National Academy of Bulgaria, establish…
https://en.wikipedia.org/wiki/Bulgarian_Academy_of_Sciences

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wikipedia NEUTRAL — The Polish Academy of Sciences (Polish: Polska Akademia Nauk, PAN) is a Polish state-sponsored national academy of sciences and institution of higher learning. Headquartered in Warsaw, it is responsib…
https://en.wikipedia.org/wiki/Polish_Academy_of_Sciences

+ 3 more evidence sources

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Claim 15: “the researchers discovered a gene expression regulation mechanism in deep-sea isopods that achieves "high efficiency, energy conservation, and precise control" via epigenetic modification of histones.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 16: “deep-sea isopods have a dual survival strategy to cope with nutrient-poor (oligotrophic) conditions: an enlarged stomach that can store large amounts of food and an extremely low basal metabolic rate (BMR).”

CORROBORATED

Multiple sources describe the dual strategy of an enlarged stomach for food storage and a low basal metabolic rate (BMR).

travel_explore

web search NEUTRAL — Supergiant deep-sea isopods endure years without food by pairing an enlarged stomach with cold-adapted metabolic control. Going without food for a day is difficult.
https://scitechdaily.com/this-strange-sea-creature-can-survi…

travel_explore

web search NEUTRAL — ...the researchers discovered that deep-sea isopods have a dual survival strategy to cope with nutrient-poor (oligotrophic) conditions: an enlarged stomach that can store large amounts of food and an …
https://english.cas.cn/newsroom/research-news/202606/t202606…

travel_explore

web search NEUTRAL — The stomach of deep-sea isopods occupies about two-thirds of their entire body, far larger than that of their shallower-water or intertidal relatives. When fully filled with food, the stomach contains…
http://english.cas.ac.cn/newsroom/research-news/202606/t2026…

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.