Are There Any Whale Sharks in Captivity?

Yes, a small number of whale sharks live in aquariums around the world, though keeping the planet’s largest fish in captivity remains one of the most logistically demanding feats in the aquarium industry. Only a handful of facilities have ever attempted it, and fewer still have managed to maintain whale sharks for extended periods. The longest-running program is at Okinawa Churaumi Aquarium in Japan, which has been working with captive whale sharks since the mid-1970s. Facilities in the United States, Taiwan, and China also house or have housed whale sharks, but the total number of captive individuals at any given time is remarkably small, likely fewer than two dozen worldwide.

Which Aquariums Have Kept Whale Sharks

Okinawa Churaumi Aquarium, on Japan’s main southern island, has the longest track record with captive whale sharks. Originally operating as the Okinawa Expo Aquarium, the facility began conducting research on whale sharks in both captivity and the wild in 1975.¹ That makes it the pioneering institution for whale shark husbandry, with nearly five decades of accumulated experience. As of the most recent published reports, the aquarium houses three whale sharks in its main exhibit tank: one male and two females.²

Georgia Aquarium in Atlanta became the first facility outside Asia to display whale sharks when it opened in 2005. Its Ocean Voyager exhibit was purpose-built for large pelagic species, and the aquarium has maintained whale sharks since its opening. The program there has not been without setbacks, however. The first two male whale sharks at the facility both declined in health and eventually died, which spurred the development of new veterinary techniques specific to the species.³

Taiwan’s National Museum of Marine Biology and Aquarium has also housed whale sharks, with at least one individual transported to its Open Ocean Tank from a coastal fishing cage.⁴ In China, Chimelong Ocean Kingdom in Zhuhai is among the facilities that have displayed them. A few other Chinese aquariums have kept whale sharks at various times, though published scientific records from these facilities are sparse compared to the Japanese and American programs. The total number of aquariums that have ever successfully kept a whale shark likely sits in the single digits.

How You Move a Whale Shark Across Land

Transporting a whale shark is an enormous undertaking even by the standards of large-animal logistics. These are animals that can weigh several tons and measure over five meters long even as juveniles, and they need to remain fully submerged in oxygenated seawater the entire time. When Taiwan’s National Museum of Marine Biology and Aquarium moved a whale shark from a coastal holding cage to its facility, the animal was lifted out of the water using a non-abrasive vinyl stretcher, then placed in a fiberglass-reinforced plastic container measuring five meters long by two-and-a-half meters wide, completely filled with seawater. The boat trip to shore alone took about 30 minutes, and then the container was loaded onto a truck for a 380-kilometer road journey that lasted 10 hours.⁴

During transit, the primary dangers are ammonia buildup from the shark’s own waste, a drop in pH from dissolved carbon dioxide, and insufficient oxygen. For the Taiwanese transport, the team pumped fresh seawater directly from the coast into the container three separate times along the route, which kept ammonia and pH in check without needing chemical buffering agents. Dissolved oxygen was maintained above full saturation throughout the trip by running compressed oxygen through an airstone. The animal, equipment, and water chemistry were checked every two to three hours. When the shark arrived at the museum, its container was moved directly into the exhibit tank.⁴

This level of care is not optional. Even a brief interruption in water quality during transport could prove fatal to a species adapted to the open ocean, where ammonia is essentially zero and oxygen is always available. The logistical challenge of transport alone explains why so few facilities have attempted to keep whale sharks.

Tank Size and the Realities of Housing the World’s Largest Fish

A whale shark cannot be kept in a standard aquarium exhibit. These animals cruise open ocean waters for thousands of kilometers, and even a large conventional tank is, by comparison, a puddle. Okinawa Churaumi Aquarium’s main exhibit tank, where its three whale sharks live, holds 7,500 cubic meters of water.² To put that in perspective, that is roughly the volume of three Olympic swimming pools. Georgia Aquarium’s Ocean Voyager exhibit is even larger, at about 24,000 cubic meters. These are among the biggest enclosed aquatic habitats ever built, and they were designed specifically with whale sharks in mind.

Even in tanks this size, space is limited for an animal that grows throughout its life. The male whale shark at Okinawa Churaumi was caught in 1995 at a total length of 460 centimeters (about 15 feet). By December 2015, it had grown to 865 centimeters (roughly 28 feet). Its growth rate slowed over time, averaging about 28 centimeters per year for the first decade before dropping to about 12.5 centimeters per year after 2005. The two females in the same tank, housed for eight and nine years respectively at the time of measurement, were growing faster, at rates of about 33 and 37 centimeters per year.²

Wild whale sharks can reach lengths of 12 meters or more, and the largest confirmed individuals have exceeded 18 meters. Whether captive whale sharks approach those sizes is an open question. The male at Okinawa has been growing more slowly as it ages, but it is also the longest-held whale shark on record and still gaining length. Managing a fish that could eventually approach 10 meters in a confined space, even a very large one, requires constant monitoring and adjustment of the environment.

Veterinary Care That Did Not Exist Before

Much of what aquarium veterinarians now know about treating whale sharks was invented from scratch, driven by early failures. At Georgia Aquarium, the deaths of the facility’s first two male whale sharks forced the veterinary and husbandry teams to develop techniques for restraint, diagnostics, and treatment that simply had no precedent in fish medicine.³

Restraining a whale shark for a medical exam is nothing like restraining a dolphin or a sea lion. The Georgia team developed a system that uses divers, snorkelers, and staff on deck to corral the shark into a vinyl stretcher suspended in the exhibit water. The process is labor-intensive and requires significant coordination. For sedation, the team initially used a chemical anesthetic in the water at a concentration of about 75 parts per million, but later found that raising dissolved oxygen levels to 120 to 150 percent saturation could sedate the shark sufficiently for most veterinary procedures without the risks associated with chemical anesthesia.³

The veterinary toolkit now extends to blood draws, ultrasound imaging, endoscopy, injections, force-feeding via gavage when a shark stops eating, and biopsies. None of these procedures had standardized protocols for whale sharks before captive programs created them. This is one of the more quietly significant contributions of captive whale shark programs: they generate veterinary knowledge that could, in theory, be applied to wild individuals found stranded or injured.

What Captive Whale Sharks Have Taught Researchers

Studying whale sharks in the wild is inherently difficult. They are migratory, they dive deep, and encounters tend to be brief. Captive individuals offer something wild observation cannot: the ability to track the same animal continuously over years or decades. The male whale shark at Okinawa Churaumi, kept for over 29 years as of recent studies, has been fitted with data loggers to record swimming behavior in detail. Researchers found that his tail-beat frequency, swimming speed, and overall activity level dropped by 4 to 20 percent at night compared to daytime, with the difference especially pronounced when water temperatures were cooler (at or below about 23.6°C). About 90 percent of clasper crosses, a behavior thought to be related to mating, occurred during daytime hours.⁵

These behavioral details are difficult to capture in the open ocean. Knowing that whale sharks adjust their activity based on light and temperature, and that mating-related behavior clusters during the day, gives biologists working on wild populations new hypotheses to test. Captive settings also allow researchers to collect precise growth measurements over time, something nearly impossible with free-swimming individuals that are encountered only sporadically.

At Okinawa, staff have collected girth and length measurements from their captive animals alongside data from six wild-caught sharks, building a dataset that helps estimate the size of whale sharks from partial measurements taken in the field.¹ Researchers studying wild whale sharks often only get a quick photo or a single measurement before the animal swims away. Having calibration data from captive sharks whose exact dimensions are known helps make those fleeting field observations more useful.

The Goal Nobody Has Achieved Yet

No whale shark has ever been bred in captivity. This remains one of the major unresolved ambitions of the institutions that keep them. Okinawa Churaumi Aquarium has been explicit about this goal: staff monitor the size and physiological indicators of their female whale sharks specifically to track maturation, aiming to achieve the first captive reproduction of the species.¹

The challenge is formidable. Whale shark reproduction in the wild is already poorly understood. Only one pregnant female has ever been scientifically examined, a specimen from Taiwan in 1995 that was found carrying around 300 embryos at various stages of development. From that single case, scientists learned that whale sharks are ovoviviparous, meaning the eggs hatch inside the mother and the pups are born live. But almost nothing is known about mating behavior, gestation length, or the conditions that trigger reproduction.

The behavioral data from Okinawa’s male shark, including the observation that clasper-cross behavior concentrates during daytime hours, represents a small piece of this puzzle.⁵ Whether a tank, even a 7,500-cubic-meter one, could ever provide the conditions necessary for mating and gestation is genuinely unknown. But if captive breeding were achieved, it could reduce reliance on wild-caught individuals for display and potentially contribute to conservation of a species listed as endangered.

Where the Captive Sharks Come From

Most captive whale sharks were originally caught incidentally in fishing nets, not targeted by aquarium collectors. The male at Okinawa Churaumi was caught in a set-net in 1995.² The Taiwanese specimen was held in a coastal fishing cage before being transferred to the museum.⁴ Georgia Aquarium’s whale sharks were obtained from Taiwan, where a regulated whale shark fishery once operated before being closed in 2008.

The whale shark’s listing under Appendix II of CITES (the Convention on International Trade in Endangered Species) since 2002 means that international transport of whale sharks requires export and import permits and documentation that the trade is not detrimental to the species’ survival. This regulatory layer, combined with the extreme logistical difficulty and cost of transport, acts as a natural brake on the number of facilities that acquire whale sharks. It also means that the handful of individuals already in captivity become increasingly valuable to the institutions that hold them, because replacing them is neither simple nor guaranteed.

Some facilities have released whale sharks back into the wild after keeping them for a period. The Taiwanese specimen described in the transport literature was eventually returned to the ocean, suggesting that at least some institutions view captivity as temporary rather than permanent for certain individuals. Whether a whale shark that has spent years in a tank can successfully readapt to wild conditions is not well studied, though the fact that releases are attempted at all indicates some confidence that the animals retain their natural behaviors.

Why This Remains Controversial

The ethics of keeping whale sharks in aquariums are genuinely contentious, and the debate does not break neatly along pro- and anti-captivity lines. Critics point out that even the largest tanks are vanishingly small compared to the animal’s natural range, that captive whale sharks have died in facilities, and that the species’ endangered status makes every individual’s welfare a conservation concern, not just an animal-welfare one. The early mortality at Georgia Aquarium reinforced these concerns and drew significant public scrutiny.

Defenders of captive programs argue that the knowledge gained from long-term captive care, including veterinary techniques, growth data, and behavioral observations, cannot be obtained any other way. They also point to the educational impact on the millions of visitors who see whale sharks in person and may become more supportive of ocean conservation as a result. Okinawa Churaumi alone attracts millions of visitors annually, and its whale shark exhibit is the facility’s most recognized feature.

The reality is that both sides have legitimate points, and the ethical calculus depends partly on how much weight you give to research and education versus the welfare cost to individual animals. What is clear is that the number of facilities willing to take on the expense, risk, and scrutiny of keeping whale sharks has not grown substantially over the past two decades. The barriers to entry, from tank size requirements and transport logistics to regulatory restrictions and veterinary unknowns, are high enough that whale sharks in captivity will likely remain rare for the foreseeable future.

How Long Captive Whale Sharks Actually Live

One of the more encouraging findings from captive programs is that whale sharks can survive for decades in an aquarium setting when conditions are right. The male at Okinawa Churaumi has been in captivity for over 29 years and is still alive and active enough to serve as a research subject with data loggers tracking his swimming patterns.⁵ That is a remarkably long time for any captive marine animal, let alone one as large and ecologically demanding as a whale shark.

Wild whale shark lifespans are estimated to reach 100 years or more based on vertebral growth band analysis and radiocarbon dating, though these estimates carry significant uncertainty. Whether a captive whale shark could approach that age is unknown. The slowing growth rate of the Okinawa male after his first decade in the tank might reflect normal adult growth deceleration, or it could be influenced by captive conditions. Without more long-term captive records and better data on wild lifespans, it is hard to say whether 29 years represents a healthy fraction of a natural life or a curtailed one. What it does demonstrate is that the species can tolerate captive conditions for periods long enough to make sustained research programs viable, a fact that was far from obvious when the first whale sharks were brought into aquariums in the 1970s.

1
The 4th International Whale Shark Conference. Body measurements and size estimation of whale sharks in Okinawa Churaumi Aquarium
2
QScience Proceedings. Long-term husbandry and physical observation of the whale sharks in Okinawa Churaumi Aquarium
3
ResearchGate. Acquisition, Husbandry, And Veterinary Care Of Whale Sharks (Rhincodon typus Smith 1828) In An Aquarium Setting
4
Journal of Marine Science and Technology. Transportation, husbandary, and release of a whale shark (Rhincodon typus)
5
Fishery Bulletin. Seasonal behavioral changes of a captive whale shark (Rhincodon typus) under variable temperature and light conditions