--- title: "Whale Shark (Rhincodon typus) | AnimalTracks.wiki" description: "World's largest fish, an ocean giant armored in tooth-like scales down to its eyeballs, that filters its food out of seawater." image: "https://animaltracks.wiki/images/animals/whale-shark-1.webp" published: "2026-09-01" updated: "2026-09-14" --- # Whale Shark (*Rhincodon typus*) > **Status**: Checked against 10 sources, listed under Sources below. > **Tagline**: World's largest fish, an ocean giant armored in tooth-like scales down to its eyeballs, that filters its food out of seawater. > **Soundtrack Vibe**: Dream Pop & Shoegaze // Beach House, "Space Song" > **Soundtrack Links**: [Spotify](https://open.spotify.com/track/1ZgMsA55GIY7ICkQh5MILA) | [YouTube](https://www.youtube.com/watch?v=GAFwrXOsL68) > **Vibe Match**: Ethereal synth swells and soaring melancholic slide melodies for a fish that, off Mexico's Yucatan, feeds by cruising at about 1.1 meters per second with its mouth open at the surface, for around 7.5 hours a day. ## Biological Superpowers & Stats - **Taxonomy**: *Rhincodon typus* - **Danger Level**: Low - **Conservation Status**: Endangered ([IUCN Red List](https://doi.org/10.2305/iucn.uk.2025-2.rlts.t19488a126673248.en)) - **Superpower**: Dermal denticles that armor its eyeballs, and 20 filter pads that strain more than 600,000 liters of seawater an hour in a 6-meter shark, by one estimate. - **Habitat**: Warm tropical and subtropical oceans worldwide, usually offshore; frequents coastal upwelling areas and sometimes enters lagoons and coral atolls - **Diet**: Zooplankton, including sergestid shrimps and fish eggs, plus krill, jellies, copepods, coral spawn, and small fishes such as sardines and anchovies - **Tags**: shark, filter-feeder, giant-size, deep-diver ## Natural History & Behavior ## Sizing Up a Giant The whale shark (*Rhincodon typus*) is the largest fish alive. A current aquarium profile gives its common length as 18 to 32.8 feet (5.5 to 10 meters), and the largest measured at 61.7 feet (18.8 meters). It adds that a living whale shark is "very difficult to weigh accurately." One 10-meter female, whose vertebrae were studied for a 2020 aging paper, had an estimated weight of about 7,000 kilograms (15,400 pounds). Its authors counted growth bands in the vertebrae of 20 sharks, used carbon-14 from 1950s and 60s nuclear bomb tests to confirm that each band marks a year, and estimated ages of up to 50 years. The bands narrowed in the oldest sharks but had not stopped forming. ## Filtering the Sea A whale shark's teeth are tiny, point backward and are thought to play no role in feeding, though there are about 300 rows of them lining the inside of each jaw. Instead, water pours into a mouth up to four feet wide and through 20 filter pads meshed with holes averaging just 1.2 millimeters across. Cross-flow filtration helps keep that mesh from clogging: water drains out through the gills while plankton, which carries more momentum, keeps moving toward the back of the mouth. Off Mexico's Yucatan Peninsula, researchers estimated that a shark about 6 meters long filters more than 600,000 liters of seawater an hour while ram feeding at the surface. ## Armor Down to the Eyeballs A whale shark's skin is studded with dermal denticles, tooth-like scales that also cover its eyes. A 2020 study counted about 2,900 of these eye denticles around the iris of one shark's eye, shaped differently from the denticles on the rest of the body in a way consistent with resisting abrasion. The same study observed three captive whale sharks pull their eyes back into their sockets in under a second when a diver approached, by up to about half the eyeball's diameter. The authors knew of no other shark or ray with denticles on its eyes. > **Wound Healing** Researchers following injured whale sharks in photographs from two Indian Ocean aggregation sites estimated that the wounds reached 90 percent closure by about day 35 overall, 22 days for scrapes and 50 for cuts. One juvenile male, first seen in 2006 missing the tip of his first dorsal fin, appeared about five years later to have regrown it, which the authors called the first reported case of a shark or ray regrowing part of an appendage. ## Into the Dark Whale sharks also dive far below the surface. One tagged off Mozambique dove to 1,286 meters, deep into the mesopelagic and bathypelagic zones, while covering at least 1,200 kilometers of ocean in 87 days. The whale shark's eye pigment, rhodopsin, absorbs light best at 478 nanometers, close to the light of about 480 nanometers that fades least in the deep sea. A 2023 study traced that tuning mostly to one spot in the pigment, site 94, the same site where, in humans, a mutation causes a form of night blindness. Whale sharks are now listed as Endangered on the IUCN Red List. Their threats include entanglement in fishing nets and boat strikes. ## Frequently Asked Questions ### Why does a whale shark have tooth-like scales on its eyeballs? Whale sharks have no eyelids, so the surface of the eye is less protected than the rest of the body, which is covered in dermal denticles. A 2020 study found denticles on the eyes too, about 2,900 of them around the iris of one shark's eye, shaped differently from the ones on the rest of the body in a way consistent with resisting abrasion. The authors say they are probably useful in reducing the risk of damage to the eye's surface. The same study observed three captive whale sharks pull their eyes back into their sockets in under a second when a diver approached, by up to about half the eyeball's diameter. *(Source: [Tomita et al. 2020]())* ### How does a whale shark filter its food out of seawater? Through cross-flow filtration. Water flows into its mouth, through 20 filter pads meshed with holes averaging just 1.2 millimeters wide, and across the gills. A 2010 study described how this lets the shark swallow plankton smaller than the mesh while reducing clogging. Its authors estimated that a whale shark about 6 meters long, ram feeding at the surface off Mexico's Yucatan Peninsula, filters more than 600,000 liters of seawater an hour, and that the sharks there spent about 7.5 hours a day feeding on average. *(Source: [Motta et al. 2010]())* ### Can individual whale sharks really be told apart by their spot patterns? Yes. A whale shark's pattern of light spots and stripes stays the same for life, and no two sharks' spot patterns are exactly alike, so researchers use them like fingerprints. A 2005 study adapted a computer algorithm originally built for comparing star patterns in pictures of the night sky to match photos of whale shark spots. Tested on pictures of sharks that had already been identified, it matched the correct pairs more than 90 percent of the time. *(Source: [Arzoumanian, Holmberg & Norman 2005]())* ### How old can a whale shark get? Scientists estimate a whale shark's age by counting growth bands in its vertebrae. A 2020 study confirmed that each band marks one year by measuring radiocarbon from 1950s and 60s nuclear bomb tests inside the vertebrae and comparing it with a reference record from fish ear stones of known age. It estimated ages of up to 50 years, and the older sharks were still forming new bands. *(Source: [Ong et al. 2020]())* ## Sources 1. [Rhincodon typus (whale shark). Animal Diversity Web, University of Michigan.]() 2. [Whale Shark. Georgia Aquarium.]() 3. [Pierce et al. (2025). Rhincodon typus. The IUCN Red List of Threatened Species 2025: e.T19488A126673248.]() 4. [Ong et al. (2020). Annual Bands in Vertebrae Validated by Bomb Radiocarbon Assays Provide Estimates of Age and Growth of Whale Sharks. Frontiers in Marine Science.]() 5. [Motta et al. (2010). Feeding anatomy, filter-feeding rate, and diet of whale sharks Rhincodon typus during surface ram filter feeding off the Yucatan Peninsula, Mexico. Zoology.]() 6. [Tomita et al. (2020). Armored eyes of the whale shark. PLOS ONE.]() 7. [Womersley et al. (2021). Wound-healing capabilities of whale sharks (Rhincodon typus) and implications for conservation management. Conservation Physiology.]() 8. [Brunnschweiler et al. (2009). Deep-diving behaviour of a whale shark Rhincodon typus during long-distance movement in the western Indian Ocean. Journal of Fish Biology.]() 9. [Yamaguchi et al. (2023). Whale shark rhodopsin adapted to deep-sea lifestyle by a substitution associated with human disease. Proceedings of the National Academy of Sciences.]() 10. [Arzoumanian, Holmberg & Norman (2005). An astronomical pattern-matching algorithm for computer-aided identification of whale sharks Rhincodon typus. Journal of Applied Ecology.]() *Published September 1, 2026. 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