2026.04.12

news

A spring tradition! Whale shark will soar through the sky again this year! We will be raising our "Whale Shark Banners."

2026.02.25

news

Osaka Aquarium Kaiyukan Co.,Ltd has renewed its recruitment website (new graduate recruitment, mid-career recruitment)

2026.02.20

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.

2026.01.26

news

[Finished] Setsubun at Kaiyukan from January 26th to February 3rd! "Demon Diver" will be appearing

2025.12.18

Sales/Shop

The Kaiyukan Official Shop has reopened after renovations

The Kaiyukan Official Shop, located on the third floor of the Entrance Building, will reopen on Thursday, December 18, 2025. Opened in July 2013, the Kaiyukan Official Shop is exclusively open to visitors. Offering a wide selection of exclusive merchandise, including items curated by aquarium keeper, the shop has become a popular souvenir and memento of visitors' visits. This renovation, based on the concept of the "Product Planning Office (tentative name)," focused on every detail, from the interior design to the furnishings. The shop features fixtures inspired by tools used by aquarium keeper for feeding, including buckets and damsels (large containers primarily used for temporarily storing and transporting fish), allowing customers to enjoy a unique atmosphere. In addition, new merchandise, including towel handkerchiefs, tote bags, drawing rulers, and drawstring pouches, will be available with the renovation. If you're visiting Kaiyukan, we encourage you to stop by the revamped official shop and discover merchandise that will help you take Kaiyukan the excitement of your visit. *In order to reduce the burden on the environment, our aquarium has stopped providing paper bags in our shops. We appreciate your understanding and cooperation. Overview Location: Kaiyukan Official Shop, 3rd floor of the entrance building Hours: Same as Kaiyukan opening hours New products Towel handkerchiefs (Whale shark shark, California sea lion, Southern rockhopper penguin) Mini tote bag (Pacific Ocean, penguins) Drawing ruler (Whale shark, Southern rockhopper penguin) Drawstring bag (blue vivid, yellow vivid)

2025.11.20

news

[Ended] Merry Christmas from Underwater! "Santa Diver" Makes His Appearance

2025.11.19

Living creature information

The Tufted puffin , an endangered seabird that has been artificially raised by aquarium keeper , will be exhibited!

You can see it in the "Aleutian Islands" tank from Monday, December 1st. The "Aleutian Islands" tank , which has been undergoing renovations since April 9th, will reopen on Monday, December 1st, 2025. To coincide with this, a juvenile tufted Tufted puffin (one bird) will make its debut, having been hand-raised by aquarium keeper in the backyard. The Tufted puffin making its debut this time was born in the backyard on August 25th, 2025. From the moment it was born, aquarium keeper took on the role of parent, feeding it and weighing it. From October 20th, aquarium keeper began accompany- ing it in the pool to train it to swim at the same speed as an adult bird. While it now looks like a typical waterfowl, its beak is smaller and darker in color than an adult bird, giving it a youthful, innocent appearance. ▼Swimming training by the aquarium keeper[About the young Tufted puffin puffins] - Egg laying 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 suspended without notice depending on the animal's condition. Comment from the Tufted puffin aquarium keeper: First of all, we hope they quickly get used to their new environment, the "Aleutian Islands" tank. We've also been training them to swim thoroughly in the back yard, but their swimming style is still clumsy and very adorable, so we hope many visitors will come and see their charms, which are only seen when they are young. [About the Tufted puffin] English name: Tufted Puffin Scientific name: Fratercula cirrhata This seabird is found widely in the subarctic zone of the North Pacific Ocean. Currently, breeding has only been confirmed in certain areas of Hokkaido, Japan, but numbers are small and it is classified as endangered (Category IA) on the Ministry of the Environment's Red List.

2025.10.31

Research and studies

Physical measurements of a Whale shark were taken

Ahead of Measurement Day on Saturday, November 1st, we measured the total length and girth of the Whale shark currently on display in the "Pacific Ocean" tank on Friday, October 31st. The results are as follows: Total Length Girth Estimated Weight Estimated Age Kai (Male) 5m 30cm Last year (4m 70cm) 2m 60cm Last year (2m 30cm) 1,100kg Last year (700kg) 8-9 years old Yu (Female) 6m 20cm Last year (6m 20cm) 2m 70cm Last year (2m 60cm) 1,800kg Last year (1,800kg) 18-19 years old Umi has grown 60cm in total length and estimated weight 400kg since being brought in on October 2nd of last year. While Yu's overall length has not changed, his girth has grown by 10 cm. Because weight is estimated from his overall length, his estimated weight is the same as last year's, but it is highly likely that he has gained weight. At Kaiyukan, we regularly measure Whale shark sharks, whose detailed ecology is still unknown, as part of our Whale shark research and health management. A aquarium keeper took a tape measure to measure the whale shark's overall length and girth while it was in the tank eating, and calculated its estimated weight. Through the Weighing Day, we hope to showcase the healthy growth of these creatures and to raise awareness of Kaiyukan's health management efforts and the natural environment.

2025.10.27

Sales/Shop

[Sold out] 2026 Kaiyukan Original Calendar now on sale

A different creature from Kaiyukan appears each month! *Sold out. The original 2026 wall calendar is on sale at the shop inside the Aquarium . A different creature from Kaiyukan appears each month, such as a Whale shark, a Ringed seal, a Sand tiger Shark, and a mother and baby California sea lion . In addition, by scanning the QR code printed on each month, you can watch a special video of the tank and creatures themed around that month. [Cover] Whale shark(Pacific Ocean tank) About the Kaiyukan Original Calendar Size 59cm x 42cm (wall hanging type) Price 1,400 yen (tax included) Sales locations ①Kaiyukan Official Shop (temporary store) on the 4th floor of the Kaiyukan Building ②Kaiyukan Official Museum Shop on the 2nd floor of the Kaiyukan Building ③Online shop "KAIYUKAN official shop online" Online shop sales period: 12:00 on Monday, October 27th to 23:59 on Sunday, November 30th *Shipped sequentially from late November *Ends while supplies last Contents Cover: Whale shark (2025) December Clione(commonly known as Clione) January: Clown anemonefish February: Sand tiger Shark Asian small clawed otter shark March: Asian small-clawed otter April: Spotted eagle ray May: Southern rockhopper penguin June: California sea lion mother and child July: Whale shark August: Ringed seal September: Pacific white-sided dolphin October: Alfred manta ray November: Fish of the Great Barrier Reef December: South American coati

2025.10.07

Living creature information

Two baby King penguin born

~Watch the heartwarming raising of their young~ Two baby King penguin were born in the "Antarctica" tank on Tuesday, September 16th and Wednesday, September 24th, 2025. Both babies have been raised under the stomachs of their parents since birth, making it difficult to see them, but we are pleased to announce that the first baby has started to occasionally pop its head out from under its parents' feet, providing more opportunities to see the raising of the young, such as being fed by mouth. Both babies are thriving, and aquarium keeper are monitoring their growth by weighing them every morning. First baby (photographed on October 6th) [About the baby King penguin] [First baby] Hatching date: Tuesday, September 16th, 2025 Gender: Unknown Weight: 244g (immediately after hatching) → Approximately 1,380g (as of October 7th) [Second baby] Hatching date: Wednesday, September 24th, 2025 Gender: Unknown Weight: 192g (immediately after hatching) → Approximately 350g (as of October 7th) *Depending on the condition of the babies, the exhibit may be canceled without notice.