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Bacterial Gene Helps Deep-Sea Isopods, Zebrafish Survive Starvation

6/6/2026

Summary

Chinese Scientists Discover

Chinese scientists found that supergiant deep-sea isopods survive fasting with a stomach that stores food as a mass rich in Chlamydiae bacteria, low metabolism and a transferred bacterial gene.
Introducing the bacterial gene ND1 into zebrafish, nematodes and human cells lowered metabolism at low temperature and raised zebrafish starvation tolerance by 37 percent.
The Cell paper says the ND1-driven shift lets isopods survive up to five years without food below 2,000 meters.

Summary

Bathynomus Defy Depth

The genus Bathynomus comprises about 20 recognized species of large deep-sea isopods.
Typical “giant” Bathynomus individuals measure 8 cm to 15 cm, while “supergiant” forms can reach up to 50 cm.
By contrast, familiar terrestrial isopods such as pill bugs and sandhoppers rarely exceed about 5 cm, making Bathynomus exceptionally large.
Researchers find the isopods’ size intriguing because sustaining such mass in food-scarce abyssal habitats requires substantial energy.

Summary

**Bathynomus’ Giant Stomachs**

Researchers found that Bathynomus jamesi inhabiting roughly 898 m depth and B. doederleini found around 300 m both possess an oversized stomach filling two-thirds of their bodies.
The study compared the two species to show the genus spans deep-sea and shallower abyssal zones.
Investigators used comparative genomics, morphology, physiology, behavior studies, and metagenomic sequencing to examine adaptations.
Yuan Jianbo and co-authors produced a schematic visualizing the stomach’s large capacity.

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Chinese Scientists Discover

Chinese scientists found that supergiant deep-sea isopods survive fasting with a stomach that stores food as a mass rich in Chlamydiae bacteria, low metabolism and a transferred bacterial gene.
Introducing the bacterial gene ND1 into zebrafish, nematodes and human cells lowered metabolism at low temperature and raised zebrafish starvation tolerance by 37 percent.
The Cell paper says the ND1-driven shift lets isopods survive up to five years without food below 2,000 meters.

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