# Crystal Jellies (DD-056)

> Aequorea victoria, the crystal jelly, is a hydrozoan (a hydromedusa), not a true jellyfish. It lives from the Bering Sea to Baja California. In light-producing organs around its bell margin, the protein aequorin gives off blue light when it binds calcium, and GFP converts that light to green. Osamu Shimomura isolated both proteins in 1962. GFP later became a key tool in biology and was the subject of the 2008 Nobel Prize in Chemistry.

- Department: Nature (also Science)
- First published: 2025-06-04
- Last updated: 2025-06-04
- Permalink: https://detailenjoyer.com/case/crystal-jellies/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## On the timeline

- **1962**: Shimomura and colleagues report aequorin and GFP
- **1992**: GFP gene sequenced
- **2008**: Nobel Prize in Chemistry to Shimomura, Chalfie and Tsien

Full timeline: https://detailenjoyer.com/timeline/?case=crystal-jellies

## Quick facts

- **DD-056-F01**: GFP doesn't make light itself; it turns aequorin's blue light green. _(Write-up · Exhibit D (Blue to green))_
- **DD-056-F02**: The crystal jelly is a hydrozoan, not a true jellyfish. _(Write-up · Exhibit A (Not a true jelly))_

## Write-up

A nearly invisible jelly whose glow lit up biology. Aequorin makes blue light; GFP turns it green.

1. **Not a true jelly**: The crystal jelly is a hydrozoan. Its free-swimming stage is a hydromedusa, which buds off a tiny polyp. Most hydromedusae are under about 1 cm across, but this one is unusually large.
2. **Range and size**: It is found from the Bering Sea to Baja California and in the Gulf of California, mostly in nearshore waters and large bays. Reported adult bell diameters vary by source: 8 to 25 cm in the Scripps guide, and up to 16 inches at the Oregon Coast Aquarium.
3. **Body plan**: It is almost entirely transparent. Up to about 100 radial canals run to the bell margin, which carries up to about 150 tentacles in fully grown specimens. The light comes from more than 100 tiny organs along the bell's edge.
4. **Blue to green**: In 1962 Shimomura and colleagues reported aequorin, a protein that gives off blue light when it binds calcium. They also reported a separate green-fluorescent protein. GFP produces no light on its own. It takes energy from aequorin and re-emits it as green light peaking near 510 nm, which is why the jelly's glow looks green.
5. **From jelly to Nobel**: The specimens were collected at Friday Harbor, Washington. GFP's gene was sequenced in 1992 (238 amino acids), and the protein became a widely used marker in cell biology. Shimomura, Martin Chalfie and Roger Tsien shared the 2008 Nobel Prize in Chemistry for its discovery and development.

## Related case files

- [Cherenkov Glow (DD-020)](https://detailenjoyer.com/case/cherenkov-glow/): Another blue glow, from physics rather than biology: Cherenkov light in water.
- [Jellies (DD-143)](https://detailenjoyer.com/case/jellies/): I linked another glowing jelly
- [Seahorse Secrets (DD-191)](https://detailenjoyer.com/case/seahorse-secrets/): I linked more ocean life
- [The Ghost Mushroom (DD-289)](https://detailenjoyer.com/case/the-ghost-mushroom/): I paired it with another organism that makes its own light

## Reel vs. record

- **Size**: '10 cm' understates it. Sources report adult bells of 8 to 25 cm (Scripps), and the Oregon Coast Aquarium says up to 16 inches.
- **Mechanism**: the two proteins have different roles. Aequorin emits blue light when it binds calcium, and GFP absorbs that energy and re-emits it as green. GFP is fluorescent, not bioluminescent itself.
- **Taxonomy**: it is a hydrozoan (hydromedusa), not a true jellyfish, despite the name.
- **Range**: more precisely, it lives from the Bering Sea to Baja California and the Gulf of California, mostly in nearshore waters and bays.
- **Missing context**: Shimomura isolated aequorin and GFP from this species in 1962, and GFP's development won the 2008 Nobel Prize in Chemistry (Shimomura, Chalfie, Tsien).

## Video: Crystal Jellies: A Nearly Invisible Jelly Whose Glow Lit up Biology

- Duration: 25.6 s · Published: 2025-06-04
- File: https://detailenjoyer.com/assets/videos/DKf3TyFokdU.mp4

### Transcript

DID YOU KNOW? The crystal jellyfish, also known as Aequorea Victoria, is a nearly transparent, delicate jellyfish native to the Pacific Ocean, especially abundant along the western coast of North America. Its bell can reach up to 10 cm in diameter, and is rimmed with hundreds of slender tentacles. What makes it famous is its bioluminescence. When disturbed, it emits a ghostly glow, a phenomenon that is the result of the proteins aequorin and green fluorescent protein, or GFP. NOW YOU KNOW!

## Questions & answers

**Q: What color light does aequorin itself emit?**  
A: Aequorin emits blue light; GFP converts it to green. _(Source: Write-up · Exhibit D (Blue to green) · Nobel Prize: The green fluorescent protein: discovery, expression and development (Scientific Background, Chemistry 2008))_

**Q: What triggers aequorin's light?**  
A: Aequorin gives off light when it binds calcium. _(Source: Write-up · Exhibit D (Blue to green) · Nobel Prize: The green fluorescent protein: discovery, expression and development (Scientific Background, Chemistry 2008))_

**Q: What kind of animal is the crystal jelly?**  
A: It is a hydrozoan whose medusa stage is a hydromedusa. _(Source: Write-up · Exhibit A (Not a true jelly) · Oregon Coast Aquarium: Crystal Jelly; Wikipedia: Aequorea victoria)_

**Q: Who shared the 2008 Nobel Prize in Chemistry for GFP?**  
A: Shimomura, Chalfie and Tsien shared the 2008 prize. _(Source: Write-up · Exhibit E (From jelly to Nobel) · Nobel Prize: The green fluorescent protein: discovery, expression and development (Scientific Background, Chemistry 2008); Wikipedia: Aequorea victoria)_

**Q: Where does the jelly's light come from?**  
A: More than 100 tiny organs along the bell's edge. _(Source: Write-up · Exhibit C (Body plan) · Wikipedia: Aequorea victoria; Oregon Coast Aquarium: Crystal Jelly)_

## Sources

- [Nobel Prize: The green fluorescent protein: discovery, expression and development (Scientific Background, Chemistry 2008)](https://www.nobelprize.org/uploads/2013/06/advanced-chemistryprize2008.pdf)
- [Scripps Institution of Oceanography Zooplankton Guide: Aequorea spp.](https://sio-legacy.ucsd.edu/zooplanktonguide/species/aequorea-spp)
- [Oregon Coast Aquarium: Crystal Jelly](https://aquarium.org/animals/crystal-jelly/)
- [Wikipedia: Aequorea victoria](https://en.wikipedia.org/wiki/Aequorea_victoria)

## Cite this case file

Easterling, Marcus. "Crystal Jellies." The Detail Department (DetailEnjoyer), case file DD-056, last updated Jun 4, 2025. https://detailenjoyer.com/case/crystal-jellies/