One of the world's strangest sharks is the goblin shark , which appears on lists of the rarest fish . Its very name reveals an exotic shape that, at first glance, commands respect . Although it looks like a shark straight out of a fantasy novel, it is very real. Often, reality surpasses fiction , and this is one of those cases: the goblin shark is a genuine shark that inhabits the depths of the sea.
Want to learn all the secrets about this unique shark? Here we explain it in detail, with expanded and updated information about its biology, habitat, and behavior.
Key features
This is a shark with a unique morphology belonging to the Mitsukurinidae family. This family is extinct, except for this species, which is why it is often considered a "living fossil ." Although its appearance may be unsettling, it doesn't reach enormous sizes: it grows up to 6 meters long and can weigh up to 700 kg . Its body is elongated and laterally compressed , a shape that helps it glide along the seabed and move efficiently in deep water.
Because it inhabits areas with very little light , it has developed remarkable adaptations. Its most notable feature is its very long and flattened snout, a kind of "rostrum" or "rostrum" containing electroreceptor organelles (ampullae of Lorenzini) that detect the electric fields emitted by other animals. This characteristic, combined with its vision and sense of smell , allows it to locate prey without relying on ambient light.
The jaw is very long and narrow , and the mouth is located below the snout. It is capable of projecting itself forward impressively when capturing prey, extending several centimeters. It has approximately 100 to 120 teeth, arranged in several rows. Detailed dental counts indicate that there are between 35 and 53 rows in the upper jaw and between 31 and 62 rows in the lower jaw, with larger, pointed teeth at the front and smaller ones at the back. Overall, the dentition is visible even when the mouth is closed at certain angles.
The size of these teeth varies and grows as they are replaced, dynamically filling the available spaces in the mouth. Although the arrangement may appear misaligned, the dentition is very effective for wedging and holding slippery prey in pelagic and demersal environments.
Fins and color
The dorsal and pectoral fins are relatively small and are usually more visible than the pelvic and anal fins, which are comparatively larger. The dorsal fins have rounded contours, consistent with a slow swimming style and less powerful musculature than that of other, faster sharks. This design explains part of its predatory strategy, which is based on stealthy approach and explosive jaw attacks.
As for its coloration, its skin is pale with tones ranging from pinkish-white to reddish-brown . The characteristic pinkish appearance is due to its thin, translucent skin, through which the blood vessels are visible, not to it being covered in blood. When removed from the water, the tone can quickly turn brownish . Its eyes are small , a trait consistent with life in environments with very little light.
Food and habitat
Like other sharks, the goblin shark is carnivorous . Its diet includes squid and other cephalopods , crustaceans (crabs and ostracods , among others), as well as bottom-dwelling and bottom-water teleost fish . They may occasionally consume bivalves depending on the area and food availability. In general, their teeth are designed for pinning and holding prey rather than cutting it, so they often swallow whole pieces or large fragments.
They can hunt using a combination of sight, smell, and electroreception . Despite not being a fast swimmer, they are efficient predators : they approach slowly, minimizing the movement of their fins so as not to alert their prey, and at the decisive moment, they thrust their jaws forward with great speed, catching their victim by surprise. They often take advantage of low-light conditions and environmental confusion to carry out ambushes.
Regarding its habitat and distribution, it is found across much of the world's oceans : the western and eastern Atlantic, the western Indian Ocean, and the western Pacific. Its presence is most documented from Australia to the coasts of Japan , although specimens have also been recorded in areas such as South Africa, Tanzania, Brazil, the Gulf of Mexico , and even in more temperate areas of the northeastern Atlantic. Its wide distribution is not limited to a specific geographic region , making it an unpredictable and difficult predator to study.
In terms of depth, it occupies ranges from relatively deep waters (several hundred meters) to abyssal zones above 1,000 meters. Reliable records frequently place it at depths of 200–300 m and in abundance around 1.300–1.400 m , although it can make vertical movements to take advantage of trophic or thermal windows . In some locations, juveniles have been observed using shallower waters than adults.
Reproduction and behavior of the goblin shark
This shark is an enigmatic species, with wide, unpredictable movements that don't confine themselves to any specific region. Its reproduction is less well understood due to its deep-sea life, but it is known to be ovoviviparous : the embryos develop in eggs that remain in the female's womb until hatching. Like other sharks with this strategy, it produces few offspring , but they are relatively large , which increases their initial survival rate.
It is capable of migrating long distances to mate , and mature females have been found at certain times of the year, suggesting seasonal reproductive peaks in some regions. Although data is scarce, fertilization is considered to be internal and, after gestation, the hatchlings are ready to feed themselves thanks to their functional jaws from birth.
In terms of its behavior, it is slow and generally calm , with a strategy based on stealth hunting . It frequently intensifies its activity during low-light hours , such as before dawn and at night, when it makes vertical movements and explores more productive water layers. Despite its appearance, it is not dangerous to humans , and no confirmed attacks have been documented; however, a bite could cause damage due to its sharp teeth.
Protractile jaw and teeth: how it captures its prey
The goblin shark's most distinctive anatomical feature is its protrusible jaw . This mechanism functions like a biological spring: after a slow approach, the shark opens it slightly and then suddenly projects both jaws outward, increasing its bite range and closing speed. The snout acts as a sensor , guiding the final bite toward the source of the detected electric field, whether it be a fish, cephalopod, or crustacean.
Its thin, curved front teeth are designed for impaling and holding prey, while the smaller, blunt back teeth aid in gripping . This dental architecture explains why, unlike sharks with sharp teeth, the goblin shark is more likely to swallow soft-bodied prey, such as squid, whole and firmly grasp delicate-scaled fish without immediately dismembering them.
Distribution, depth and movements
The goblin shark has been recorded in numerous continental margins and island areas of the Atlantic, Indian, and Pacific Oceans. It is characteristic of continental slopes , seamounts, and deep shelves, where the availability of pelagic and demersal prey allows for a varied diet. In several regions, juveniles have been observed more frequently at shallower depths than adults, suggesting ontogenetic habitat use.
Furthermore, this species can perform daily vertical movements , approaching the surface at night in search of food and returning to deeper layers during the day. This vertical plasticity, combined with its wide distribution , contributes to its being rarely sighted, as much of the available information comes from incidental catches in deep-sea trawl fisheries.
Conservation status and threats
Although rarely targeted by specific fisheries, the goblin shark is frequently caught incidentally in trawls and driftnets. Most incidentally caught individuals are juveniles , leading to the inference that adults spend more time outside the depth range where many fleets operate. Globally, it has been listed as a species of least concern due to its apparent low immediate vulnerability; however, this assessment is tempered by uncertainty stemming from limited data, making monitoring and management of deep-sea fisheries crucial.
Another source of pressure is the interest of collectors in their jaws, which can encourage unwanted captures. In any case, as it is a deep-sea species and uncommon at the surface, interaction with humans is minimal, and most records come from scientific expeditions and bycatch.
Curiosities and little-known facts
– It's a species very difficult to keep in captivity, and the few specimens that have arrived alive at facilities have only survived for a short time; their physiology is adapted to high pressures and low temperatures.
– Your body has a consistency flabby compared to other pelagic sharks; this is associated with a lifestyle of low energy expenditure and ambush.
– Goblin sharks sometimes approach layers of water with greater nighttime productivity, taking advantage of vertical migrations of zooplankton and mesopelagic fish that rise in the dark.
- Their visible anterior teeth Even with their mouths closed, they have fueled an intimidating popular iconography, although in practice it is a shark not aggressive with the people.
The goblin shark is emerging as a specialist of the deep: a shark with a unique anatomy , possessing a sensory snout that allows it to detect prey in the dark and a protrusible jaw perfect for ambush. Its wide distribution, elusive habits, and deep-sea lifestyle explain why it is so rarely seen. As deep-sea observation technologies advance, it is hoped that more will be revealed about its reproduction, movements, and ecology , while keeping in mind the need to properly manage deep-sea fishing to maintain a healthy population.