Living creature information
The Tufted puffin , an endangered seabird that has been artificially raised by aquarium keeper , will be exhibited!
November 19, 2025
You can see them in the "Aleutian Islands" tank from Monday, December 1st.
The Aleutian Islands tank , which has been undergoing renovation since April 9, 2025, will reopen on Monday, December 1, 2025.
To coincide with this, one young tufted Tufted puffin , which has been hand-raised by aquarium keeper in the back yard, will make its debut.
The Tufted puffin making its debut was born in the backyard on August 25th, 2025. From the moment it was born, the aquarium keeper took on the role of its parents, feeding it and measuring its weight as it was raised. From October 20th, the aquarium keeper began to accompany it in the pool to train it to swim just as well as an adult bird. It now looks like a typical waterfowl, but its beak is smaller and darker in color than an adult bird, so you can still see its young and innocent appearance.
Swimming training by aquarium keeper
[About young Tufted puffin]
- Spawning date: Friday, July 18, 2025
・Hatching date: Monday, August 25, 2025
Gender: Unknown Weight: 54g (immediately after hatching) → 610g ( as of November 19, 2025)
*Exhibition may be canceled without notice depending on the condition of the creatures.
Comments from the Tufted puffin aquarium keeper
First of all, I want them to quickly get used to their new environment , the "Aleutian Islands" tank. They have also been thoroughly trained to swim in the backyard, but their swimming style is still clumsy and very adorable, so I hope many visitors will be able to see the charms that only young birds have.
[About the Tufted puffin]
English name: Tufted puffin
Scientific name: Fratercula cirrhata
This seabird is widely distributed in the subarctic regions of the North Pacific Ocean, and although breeding has been confirmed only in certain areas of Hokkaido in Japan, its numbers are small and it is classified as endangered (Category IA) on the Ministry of the Environment's Red List.
Check out this creature's blog too!
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Living creature information
[Limited Time Only] Baby Barrier reef chromis on Display
Baby Barrier reef chromis, a species of damselfish endemic to the Great Barrier Reef, the world's largest coral reef, are on display for a limited time at the aquarium keeper counter on the 4th floor of the entrance building. These babies were hatched in the tank after the Great Barrier Reef tank was renovated, with the eggs laid by the parent fish being collected by the aquarium keeper. Although still small, they have grown to the point where their distinctive features, such as their yellow heads and the black stripe running from their eyes to their dorsal fins, are clearly visible. You can also watch aquarium keeper explain the species and feed them daily from 1:10 PM to around 2:00 PM. Information about the breeding behavior of Barrier reef chromis and other damselfish species is also available on the blog "Behind the Scenes at Kaiyukan ." Period: February 20, 2026 - April 20, 2026 (tentative) Location: aquarium keeper Counter, 4th Floor, Kaiyukan Entrance Building *The exhibition may be suddenly canceled depending on the condition of the animals. Barrier reef chromis ( English name: Barrier reef chromis, scientific name: Chromis nitida) is a species endemic to the Great Barrier Reef. Among damselfish, which are generally territorial and aggressive, it has a relatively gentle temperament.