top of page

Hirondellea gigas

 Hirondellea gigas is an ultra-deep sea creature that lives in the deepest part of the Mariana Trench Challenger Deep in the world. It was also confirmed that it inhabits the Izu-Ogasawara Trench near Japan and the ultra-deep waters of the Japan Trench. Hirondellea gigas is a species of gammaridea, and its scientific name is Hirondellea gigas. In fact, it is one of the most studied deep-sea creatures.

What do you eat and live in the desert of the sea, the ultra-deep sea?

 In general, gammaridea live by eating the carcasses, excrement, and microorganisms of other creatures. However, because of the extremely high water pressure in the ultra-deep sea, there are not many organisms and species. For this reason, the ultra-deep sea is called the "sea desert." Of course, food problems are also serious for Hirondellea gigas. In the deepest part of the world with ultra-high water pressure, we have no choice but to rely on things that fall from land or shallow sea.

 Falling objects include corpses and excrement of living things, and plant fragments from land. However, the carcasses and excrement of living things are also a treat for fish, shrimp, crabs, and microorganisms that live in shallow waters and middle layers. It hardly reaches the bottom of the deep sea where Hirondellea gigas live. On the other hand, plant pieces such as driftwood and fallen leaves fall without being eaten on the way. Therefore, Hirondellea gigas feeds on this piece of plant. Other fish, shrimp and crabs do not eat plant pieces. This is because plant pieces cannot be broken down into nutrients. Hirondellea gigas, on the other hand, has an enzyme that can break down plants into sugar. Hirondellea gigas can live in the deep sea without food by eating driftwood and fallen leaves that fall from the land.

Why there are no shrimp and crabs in the ultra-deep sea

Shells of shellfish, shrimp and crabs are very strong. Its tough shell is made of calcium carbonate crystals. In the case of shrimp and crabs, their feet and hands are also covered with shells, which are used to grab or pinch something. For shrimp and crabs, hard shells are a daily necessities. However, shrimp and crabs with hard shells are rarely found in the ultra-deep seas that exceed 5000 m in depth. This is because high water pressure melts calcium carbonate crystals in the ultra-deep sea. Therefore, shrimp and crab cannot live in the deep sea.

The shell of Hirondellea gigas doesn't melt even in the ultra-deep sea.

Hirondellea gigas inhabits the ultra-deep waters where calcium carbonate dissolves. However, the shell of Hirondellea gigas is made of calcium carbonate crystals. Why doesn't calcium carbonate dissolve? This is because the surface of Hirondellea gigas is covered with aluminum gel. Aluminum gel is made of aluminum hydroxide. Previously, aluminum gel was added to headache medicines as a protective agent for gastric mucosa. Aluminum gel protects Hirondellea gigas and prevents the dissolution of calcium carbonate .


There are still many secrets of Hirondellea gigas. Where do you bring aluminum, which is rarely contained in seawater? Not explained here. Hirondellea gigas, which live in the deepest parts of the world, are creatures that fascinate the evolutionary results of living organisms in various places.

Resin-embedded specimen of Hirondellea gigas

This is a resin-embedded specimen of Hirondellea gigas collected on the deep sea floor near Japan. It is the same as the specimen exhibited at the "Deep Sea Exhibition" held at the National Museum of Nature and Science. The size of the specimen is 7.5 cm in width, 4 cm in length, and 3 cm in thickness.

We rent out Hirondellea gigas specimens. It costs 1000 yen (excluding tax) for 2 days and 1 night (round trip shipping fee 1200 yen (up to 6)). It can be widely used from science education to special exhibitions. We also have pamphlets and posters with detailed explanations. Please feel free to contact us.

Requests and inquiries for lending are accepted by e-mail.

Give you the power to withstand the pressure

Speaking of creatures that are resistant to pressure, they are deep-sea creatures. It lives well in the harsh environment of darkness and low temperature with high water pressure and almost no food. And the creature that lives on the deepest seabed in the world is Hirondellea gigas. Previously reported footage showed Hirondellea gigas swimming vigorously in the Mariana Trench, the deepest part of the world. Hirondellea gigas is the strongest organism that can withstand the strongest pressures in the world and survive in the stressful environment of low temperature, darkness and oligotrophic conditions. When it comes to pressure resistance and stress resistance, no one can beat it.

Rabbit's foot is a well-known amulet in the United States and the United Kingdom. There are various theories about its origin. The theory that the rabbit was prolific and a symbol of vitality and fertility, the theory that it was used as a catalyst for magical rituals, and when it was believed that some of the bodies of villainous criminals would bring good luck. There is a theory that the foot can be used as a substitute.

Let's get rid of pressure and stress by wearing a part of Hirondellea gigas. Amulets made from Hirondellea gigas do not have a physiologically strong effect on your heart, but they will surely support your heart.

The shell of Hirondellea gigas is a product that is never available to the general public.


Hirondellea gigas

Hirondellea gigas collected from the deep part of the Izu-Ogasawara Trench in the Japan Trench near Japan. It also inhabits in the Deepest point of the Challenger Deep in the Mariana Trench on Earth.


English and Japanese commentary plate

We have prepared a commentary plate for Hirondellea gigas. English and Japanese are available. It is a size that fits in a talisman bag.


Hirondellea gigas shell

The shells were separated by dismantling the Hirondellea gigas. In fact, Hirondellea gigas is almost only shells when it is lifted from the deep sea.


All items of amulets.

All items of amulets. The amulet bag is made of leather. It is engraved with H. GIGAS.


The shell was embedded in resin.

The shell of Hirondellea gigas was embedded in resin. This is the contents of the amulet. I also embedded the nameplate of the scientific name Hirondellea gigas .


It is the appearance of a talisman.

The size of the amulet is 4.5 cm wide and 7 cm long. Durable leather and metal fittings are used to prevent loss.

Click here to order
bottom of page