The whale shark is the largest fish in the sea!
  • Size

    8 - 32.8 feet (5.5 - 10 m)
  • Diet

    Zooplankton, specifically sergestid shrimps and fish eggs as well as krill, jellies, copepods, coral spawn, etc. and small fishes
  • Range

    Tropical Atlantic, Pacific, and Indian Oceans between about 30 degrees North and 35 degrees South
  • Habitat

    Typically found offshore but will come close to shore

Physical Characteristics

Size

  • The whale shark is the largest fish in the world and the largest fish known to have lived on this planet. Because of its size and cartilaginous skeleton, it does not fossilize well and in life it is very difficult to weigh accurately.
  • The largest accurately measured whale shark was 61.7 feet (18.8 m).
  • The average length is between 18 and 32.8 feet (5.5 – 10 m).
  • Newborns measure 21 to 25 inches (53 – 64 cm) long.

Body Composition

  • Whale shark has a broad, flat head, relatively small eyes, five large gill slits, two dorsal fins, two long pectoral fins, two pelvic fins, one anal fin and a large sweeping tail. It has a vestigial spiracle behind the eye, which is an evolutionary remnant of its common ancestry with bottom-dwelling (benthic) carpet sharks.
  • Unlike most shark species, its mouth is located at the front of the head (terminal) instead of the underside of the rostrum (subterminal).
  • The whale shark has a huge mouth, which can reach up to 4 feet (1.4 m) across, located at the front of the head.
  • Inside the mouth are specialized flaps called velums. These stop the backflow of water as the whale shark closes its mouth, preventing the loss of food.
  • The skin of an adult whale shark can be as thick as 4 inches (10 cm) and has the consistency of strong rubber, which limits possible predators to killer whales, great white sharks, tiger sharks and humans.

Color

  • Whale shark has a two-toned pattern of light spots on its dark gray back with a white underside.
  • Each whale shark has its own individual spot pattern; like human fingerprints, no two are exactly alike.

Teeth

  • Teeth of the whale shark are tiny and pointed backward; they are thought to have no function in feeding.
  • There are about 300 rows of tiny teeth along the inner surface of each jaw, just inside the mouth.

 

Animal Fact

Although it’s the largest fish in the world, the whale shark eats some of the tiniest creatures in the ocean, called zooplankton

Diet / Feeding

Diet

  • Consists of zooplankton, specifically sergestid shrimps and fish eggs as well as krill, jellies, copepods, coral spawn, etc. and small fishes (sardines, anchovies, etc).
  • Can only swallow small prey because its throat is very narrow, often compared to the size of a quarter.

Feeding Behaviors

  • A whale shark filters food from the water by “cross-flow filtration,” which means the particles do not catch on the filter. Rather, water is directed away through the gills while particles (which have more momentum) carry on towards the back of the mouth in an ever more concentrated stream. A bolus or spinning ball of food grows in diameter at the back of the throat until it triggers a swallowing reflex. This is very efficient and does not clog the filters.

Range / Habitat

Range

  • Occurs worldwide in the tropical Atlantic, Pacific, and Indian Oceans between about 30 degrees North and 35 degrees South, though it has been sighted as far as 41 degrees North and 36.5 degrees South.

Habitat

  • Typically found offshore but will come close to shore, sometimes entering lagoons or coral atolls. Frequents shallow water areas near bays and upwelling coastal areas near continental drop-offs, sometimes during seasonal plankton blooms.

Reproduction & Growth

  • The whale shark is ovoviviparous, meaning the embryo is formed within an egg, which then hatches in the mother’s uterus. At term, the young are released into the sea fully-formed. The only litter size that has ever been documented was more than 300 pups.
  • Very little is known about whale shark mating behavior as it has been observed only twice in its natural habitat, and never in an aquarium setting.

Additional Information

  • Usual swim speed when feeding at the surface is roughly 2 knots (a typical walking pace of 2.3 mph). When cruising, it averages about 2.5 knots (2.9 mph). When alarmed, the whale shark has been observed accelerating to a body length per second for very short bursts, but they cannot sustain fast swimming for long.
  • The whale shark is not thought to be able to breach at all, unlike the basking shark.

Sources

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