2026.07.15

news

A new "Sand Tiger Sand tiger Shark " is now available at the Kaiyukan Official Shop! A mini exhibition featuring Sand tiger Shark will also be held!

Kaiyukan's sand Sand tiger Shark are now available as plush toys! Two types, male and female, supervised by aquarium keeper , are now on sale! A mini-exhibition, "Diving into the World of Sand tiger Shark Tiger tank ," introducing the ecology of Sand tiger Shark tiger Sand tiger Shark , currently on display in the "Pacific Ocean" tank, are now on sale at the Kaiyukan Official Shop inside the Kaiyukan . These plush toys were supervised by Kaiyukan aquarium keeper. Attention has been paid to even the smallest details, from the shape of the fins and exposed teeth to the characteristics of the male and female and the mottled patterns on their bodies. These are "creepy-cute" items that you'll want to take home. →What is a Sand tiger Shark? Sales location: Kaiyukan Official Shop Price: 2,900 yen (tax included) *Same price for males and females Size: Males approx. 46cm, females approx. 52cm Points supervised by aquarium keeper : Expressing the many sharp teeth Body shape (silhouette) Notches at the base of the fins Matching the size of the second dorsal fin, anal fin, and the lower half (lower lobe) of the caudal fin Expressing the length of the gills Different sizes for males and females (females are larger than those on display) ▼Also reproduces the difference between males and females. Males have genitalia at the base of the left and right pelvic fins (left photo), females do not (right photo). Comment from the person in charge: We have reproduced the " Sand tiger Shark ," a rare and endangered species that is very popular at Kaiyukan , as a plush toy under the supervision of the aquarium keeper. The body shape is that of a typical "Sand tiger Shark," but the pattern is in almost the same position as the individuals at Kaiyukan , so we hope that even after customers take it home, it will be a reminder of the " Sand tiger Shark " swimming at Kaiyukan . → About the Kaiyukan Official Shop Mini-Exhibition "Sand tiger Shark Exhibition ~Diving into the World of Sand tiger Shark~" will be held (from July 17th) This mini-exhibition will introduce the ecology of Sand tiger Shark sharks, their current status as an endangered species, their relationship with the Ogasawara Islands, and Kaiyukan's efforts to raise visitors' understanding of and interest in Sand tiger Shark tiger sharks. Exhibition Period From Friday, July 17, 2026 *End date undecided Venue Kaiyukan 4th Floor Viewing Room Main Contents ・What kind of Sand tiger Shark is a sand tiger shark? ・Where do they live? ・Special skills that only Sand tiger Shark can do ・The secret of their sharp teeth ・Survival even before birth! ・Sand tiger Shark have come to Kaiyukan! ・The sand Sand tiger Shark shark's habitat created by Kaiyukan・Connecting to the future Price Included in Kaiyukan admission fee

2026.07.01

Living creature information

A second California sea lion pup of the year has been born.

~Two calves born in the same year for the first time in four years~ A male California sea lion lion pup was born in the Monterey Bay tank at 7:28 a.m. on Wednesday, July 1, 2026. Another California sea lion pup was born on Wednesday, June 17, making this the second birth this year. On Monday, June 29, 2026, signs of labor were observed in Asuka (16 years old), a female living in the Monterey Bay tank, and aquarium keeper intensified their observations. At 7:28 a.m. on Wednesday, July 1, the birth of the male pup was confirmed. Nursing was observed about two hours after birth, and the postpartum recovery appears to be progressing smoothly. California sea lion pups are nourished by their mother's milk for about one year after birth. As the parenting takes place in the exhibit tank, depending on the time and location, you may be able to see the heartwarming scene of mother and child. The mother and baby (photographed on July 1) About the newborn baby (photographed on July 1) ・Date of birth: Wednesday, July 1, 2026 ・Exhibition tank : Monterey Bay tank on the 7th floor of Kaiyukan Aquarium ・Body length: 60 cm (estimated) ・Sex: Male ・Parents: Mother Asuka (16 years old), father unknown About California sea lion English name: California sea lion Scientific name: Zalophus californianus They inhabit only the eastern coast of the North Pacific Ocean. When fully grown, males reach a body length of approximately 200 cm and a weight of approximately 300 kg, while females reach a body length of approximately 170 cm and a weight of approximately 100 kg. Males are entirely dark brown, while females are a slightly lighter dark brown. Their limbs are well-developed and are useful not only for swimming in the water but also for walking on land. They are polygamous, with one male leading a group called a "harem" with approximately 30 females and offspring. The gestation period is approximately one year. Typically, they give birth to one calf at a time and continue nursing it for about a year after birth. ★At the Kaiyukan, California sea lion and Southern rockhopper penguin have been born one after another from May to June 2026, experiencing a baby boom. → A California sea lion pup was born (June 18, 2026) →Baby boom!! A Southern rockhopper penguin chick was born (June 8, 2026)

2026.06.18

Living creature information

California sea lion baby born

Mother is raising her baby in the Monterey Bay tank A California sea lion pup was born in the Monterey Bay tank on Wednesday, June 17, 2026. This is the 20th California sea lion birth at Kaiyukan Kaiyukan . On Wednesday, June 10, 2026, signs of labor were observed in "Nami (14 years old)," a female living in the Monterey Bay tank, and aquarium keeper intensified their observations. At 9:47 PM on Wednesday, June 17, the birth of the baby was confirmed. The baby's sex has not yet been confirmed. *Later, it was determined to be a male. Nursing was observed about two hours after birth, and the postpartum recovery seems to be going smoothly. California sea lion pups are nourished by their mother's milk for about one year after birth. As the mother is raising her baby in the exhibit tank, depending on the time and location, you may be able to see the heartwarming scene of mother and child. Parent and child (photographed on June 18) Baby (photographed on July 1) About the baby born this time (as of June 18, 2026) (photographed on June 18) ・Date of birth: Wednesday, June 17, 2026 ・Exhibition tank : Monterey Bay tank on the 7th floor of Kaiyukan tank・Length: 60 cm (estimated) ・Weight: Unknown ・Sex: Male ・Parents: Mother Nami (14 years old), Father Unknown About California sea lion English name: California sea lion Scientific name: Zalophus californianus They inhabit only the eastern coast of the North Pacific Ocean. When fully grown, males reach a length of approximately 200 cm and a weight of approximately 300 kg, while females reach a length of approximately 170 cm and a weight of approximately 100 kg. Males are entirely dark brown, while females are a slightly lighter dark brown. Their limbs are well-developed and are useful not only for swimming in the water but also for walking on land. They are polygamous, with one male leading a group of about 30 females and offspring, known as a "harem." The gestation period is about one year. Typically, they give birth to one offspring at a time and continue nursing it for about a year after birth.

2026.06.08

Living creature information

Baby boom!! Southern rockhopper penguin chicks have been born.

You can observe the chicks raising their young in the exhibit tank . On May 29th (Fri), June 3rd (Wed), and June 7th (Sun), 2026, one Southern rockhopper penguin chick was born in the "Falkland Islands(Malvinas)" tank , bringing the total to three chicks that are growing up healthy. The chick born on May 29th already weighs over 1 kg and is growing bigger every day. aquarium keeper are monitoring the chicks' health by weighing them and observing them every morning. *The exhibit may be closed without notice depending on the condition of the chicks. In addition, to commemorate the birth of the Southern rockhopper penguin chicks, there will be poster displays and explanatory events about the ecology and breeding of Southern rockhopper penguin. →Click here for details Southern rockhopper penguin family (photographed on June 15) [About the Southern rockhopper penguin chicks] [1st chick]・Hatching date: May 29, 2026 (Friday)・Sex: Unknown・Length: Approximately 20 cm・Weight: 80.0 g (immediately after hatching) → Approximately 530 g (as of June 8) → 1045.5 g (as of June 15) [2nd chick]・Hatching date: June 3, 2026 (Wednesday)・Sex: Unknown・Length: Approximately 15 cm・Weight: 45.5 g (immediately after hatching) → 352.0 g (as of June 15) [3rd chick]・Hatching date: June 7, 2026 (Sunday)・Sex: Unknown・Length: Approximately 15 cm in length, weight: 86.6 g (immediately after hatching) → 368.0 g (as of June 15th). Photo taken on June 29th. They are growing rapidly! Baby 1 (left), Baby 2 (left), Baby 3 (left)

2026.05.30

news

We recommend purchasing Kaiyukan e-ticket in advance for entry.

With advance reservations, you can enter the aquarium smoothly without having to wait in line to purchase tickets on the day of your visit. This is especially convenient during busy periods such as weekends and holidays. -->At Kaiyukan, we recommend purchasing "Kaiyukan e-tickets (date and time specified)" online in advance to ensure a more comfortable experience for everyone. By making a reservation in advance, you can enter the aquarium smoothly without having to wait in line to purchase tickets on the day of your visit. This is especially recommended during busy periods such as weekends and holidays. "Kaiyukan e-tickets" are date and time specified tickets that allow you to specify your entry time in 15-minute increments. Because the number of tickets sold for each time slot is adjusted to a certain number, congestion is less likely to concentrate, allowing you to enjoy Aquarium more comfortably. To purchase Kaiyukan e-tickets smoothly, you need to log in to "Webket" in advance to purchase tickets. If you are not yet a member, please register as a new member first. *An error may occur if you proceed to member registration after adding tickets to your cart. Frequently Asked Questions about Kaiyukan e-tickets Q. Can I enter if I am late for my reserved time on the day of my visit? Please change the time of your ticket from your Webket My Page. If you are unable to change to your desired time, please proceed to the entrance gate as is. You will still be admitted even if you are late, but those with reservations for that time will have priority, so you may have to wait. Q. Can I cancel? If you paid by credit card, you can cancel yourself up until the day of use. (However, if a receipt has been issued, you cannot cancel.) Please cancel yourself from your Webket My Page. There is no charge for cancellation. For information on when refunds will be issued, please contact your credit card company. For other inquiries, please click here. To make your experience even more enjoyable, Kaiyukan is working to improve the viewing environment. We have established new rules regarding the size of luggage that can be brought into the Aquarium. We ask for your cooperation so that you can walk around the exhibition area at your leisure. Click here for details. As one of the measures to allow visitors to view the aquarium at their own pace, re-entry was discontinued from June 15, 2026.

2026.05.21

news

Regarding the end of re-entry

At Kaiyukan, we sell "time-slot tickets" that specify entry times in 15-minute increments and limit the number of tickets sold per time slot. This helps to reduce congestion Aquarium and improve the viewing environment, and by purchasing time-slot tickets in advance, we are working to reduce waiting times for entry. We post information on the availability of time-slot tickets on our official website and recommend purchasing web tickets in advance. In addition, since April of this year, we have established new rules regarding the size of luggage that can be brought into the Aquarium, and are striving to improve the viewing environment. As one of the measures to maintain a consistent number of visitors per time slot and allow visitors to enjoy their visit at their leisure, we have decided to discontinue re-entry from June 15, 2026. We ask for your understanding.

2026.04.27

news

The exhibit of the Tufted puffin will end on May 10, 2026.

Due to the renovation of the "Aleutian Islands" tank, the exhibit of the Tufted puffin will end on Sunday, May 10, 2026. Kaiyukan collaborated with Aqua World Ibaraki Oarai Aquarium to promote joint research on the ecology and breeding of Tufted puffin, and began exhibiting them on June 29, 2018, after receiving a transfer of Tufted puffin from the aquarium. Since then, a total of three puffins have been successfully bred, and one of them has even been successfully raised artificially, so we believe that we have achieved a certain degree of success in achieving our initial objectives. The Tufted puffin will be kept in the back area for health management before being moved to Aqua World Ibaraki Oarai Aquarium. Further details regarding the renovation of the "Aleutian Islands" tank will be announced as soon as they are decided.

2026.04.21

Living creature information

*This event has ended.* We exhibited baby Japanese giant spider crab crabs, the world's largest crabs.

On Tuesday, March 3rd, we began exhibiting baby Japanese giant spider crab crabs (megalopa larvae, 5 individuals) that were born at the Kaiyukan . [ Japanese giant spider crab crab megalopa larvae (approx. 3 mm)] On Tuesday, March 3rd, 2026, aquarium keeper discovered baby Japanese giant spider crab crabs born in the tank . Approximately 500 of them were moved to a reserve tank, where they were fed with Artemia and sakura shrimp while their growth was monitored. Immediately after birth, the babies are called "zoea larvae" and look very different from adults. Through repeated molting, they grow into "megalopa larvae" and then into "juvenile crabs" that resemble adults. The babies on display are "megalopa larvae," and are very small, with a body size of only about 1 mm and a leg span of about 3 mm. They are expected to grow into juvenile crabs (approx. 1 cm with legs spanned) in the near future. * (April 18, 2026) The megalopa larvae have grown into juvenile crabs. → Blog: "Japanese giant spider crab larvae finally grow into juvenile crabs!"Kaiyukan has successfully raised Japanese spider crabs to the juvenile stage twice in the past, in 2023 and 2025, and in 2025 they were exhibited for visitors to see. This time, we would like you to come and see the precious sight of the world's largest crab, the Japanese giant spider crab crab, which can only be seen at this stage, and feel the mystery of life from the difference in size and shape between the larvae and adults. The growth of the Japanese Kaiyukan crab larvae is also introduced in the blog "Behind the Scenes at Japanese giant spider crab ". Period: April 21, 2026 - June 11, 2026 Location : Kaiyukan Entrance Building 4F aquarium keeper Counter Species: 5 Japanese giant spider crab crab megalopa larvae (approx. 3mm) *The exhibit may be suddenly canceled depending on the condition of the creatures. The Japanese giant spider crab ( Japanese giant spider crab kaempferi) is the world's largest crab, with males reaching over 3 meters in length when extending their claws. It is also the world's largest species of arthropod, a larger taxonomic group, and is mainly distributed in the waters around Japan, but has also been caught in Taiwan and other areas. It normally lives in deep-sea areas and is known to migrate to shallow waters in the spring to lay eggs.

2026.04.16

news

[April 24th onwards] Prohibition of bringing carry-on cases and large luggage Aquarium the Kaiyukan .

Regarding the prohibition of carry-on cases and large luggage Aquarium the Kaiyukan : The rules for bringing in items have changed as of April 24th. For details, please click here. Carry-on cases and carts Pet carts Items with a total of three sides exceeding 120cm (any single side exceeding 70cm) *Please leave them at your hotel or in a coin locker before coming to the aquarium. *For details on coin lockers at Kaiyukan and Tempozan Harbor Village, please click here.

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."