Many people are surprised to learn that the white shark is a regular seasonal visitor to the Gulf and Estuary of the St. Lawrence. Far from being a rare stray, it forms part of the native marine fauna of eastern Canada and has been documented in these waters for centuries, and likely millennia.

The white shark is arguably the best-known, and most feared, shark in the world. Its reputation as a “man-eater” remains greatly exaggerated, fuelled largely by films, sensationalist headlines, and decades of misinformation. Nevertheless, it is a large and powerful predatory shark capable of seriously injuring or killing a person under certain circumstances, and interactions with humans must always be treated with appropriate caution.

In the Northwest Atlantic, white sharks undertake extensive seasonal migrations between the southeastern United States and Atlantic Canada. Today, they are regularly documented off Nova Scotia from spring onward, with many continuing into the Gulf and, occasionally, the Estuary of the St. Lawrence. Most sharks observed in the Gulf appear to be juveniles or subadults, and confirmed detections are currently most common between June and November, although some researchers suspect that certain individuals may remain in the region for even longer.

Although encounters between white sharks and humans in Atlantic Canada remain rare, they are likely to become more frequent as recovering shark populations increasingly share coastal waters with swimmers, divers, surfers, paddleboarders, fishers, and other marine users. While the statistical risk of an incident remains very low, the possibility cannot be dismissed. Understanding the species’ behaviour and adopting simple precautionary measures are therefore key to promoting safe coexistence.

Despite its growing visibility, the white shark remains endangered in Canadian waters. Its total population size is still unknown, and the species continues to face threats from accidental capture, habitat degradation, prey fluctuations, and human activity. Rather than representing the arrival of a new predator, its renewed prominence in the St. Lawrence appears to reflect the gradual recovery of one of Atlantic Canada’s most remarkable native marine species.

Table of contents

• Names
• General description
• Size & appearance
• Not every fin is a white shark
• Dentition
• Distribution
• Prey
• Predators
• Reproduction
• Life expectancy
• Human encounters & safety
• Fisheries
• Conservation status
• White shark FAQ

Common names: white shark, great white shark, white pointer, white death

White shark or great white shark? Historically, the term great white shark was used in English to distinguish this species from another shark once referred to as a “white shark,” the oceanic whitetip (Carcharhinus longimanus), formerly known in some sources as the “lesser white shark.” In French, however, the oceanic whitetip was never commonly called requin blanc or petit requin blanc. As a result, the addition of grand in grand requin blanc largely reflects an English calque rather than a necessity in French nomenclature.

Today, an increasing number of scientists and organisations are favouring the simpler term white shark. This is also the terminology adopted by the St. Lawrence Shark Observatory.

French common names: requin blanc, grand requin blanc, mort blanche

• Average length of 3.5 to 5 metres in Atlantic Canada and Québec.
• Upper body variably coloured lead grey, brownish-grey, or black, with a white ventral surface.
• Massive, torpedo-shaped body.
• Large triangular first dorsal fin followed by a much smaller second dorsal fin.
• Pectoral fins with black tips on the ventral surface.
• Upper and lower caudal lobes nearly equal in size.
• Flat, triangular teeth with serrated edges.
• Seasonal presence in Atlantic Canada and Québec.

Maximum length: up to 6.1 m[1]

Mature length: ♂ 3.5–4 m, ♀ 4.5–5 m[2]

Weight: up to 1,970 kg[3]

The white shark is the third-largest shark species and the largest predatory fish in the world. In the St. Lawrence, most individuals observed are juveniles or sub-adults. One particularly large specimen, measuring 5.23 m (17.17 ft), was accidentally captured in 1983 in the Gulf of St. Lawrence off Prince Edward Island. Growth-band analysis of its vertebrae estimated its age at 17 years, suggesting it had not yet reached full size.

As a comparison, although the Greenland shark can equal or even exceed the white shark in length, the white shark is considerably more robust and may reach nearly twice the girth and mass.

The white shark’s coloration and countershading provide effective camouflage, helping it blend into its environment while ambushing prey. However, this appearance can also lead to frequent misidentifications. In the Northwest Atlantic, the basking shark is often mistaken for a white shark because of the similar size and shape of its dorsal fin. In the St. Lawrence, the porbeagle is likewise frequently reported as a juvenile white shark.

(Below) A white shark accidentally captured in 1983, 20 km off Alberton (Prince Edward Island), remains the largest precisely measured specimen ever recorded in Canada and one of the largest documented worldwide. Examination of its stomach contents revealed the remains of two harbour porpoises, as well as several cod, possibly trapped in the fishing net.

(1) Randall, J. E. 1987. Refutation of lengths of 11.3, 9.0, and 6.4 m. attributed to the white shark, Carcharodon carcharias. California Fish and Game, 73 (3): 163–168, figs 1–3.
(2) Compagno, L., Dando, M., Fowler, S. 2005. Sharks of the World. Collins, 368 p.
(3) Uchida, S. Toda, M., Teshima, K., Yano, K. 1996. Pregnant White Sharks and Full-Term Embryos from Japan. In: Klimley, A.P. & Ainley, D. (Eds.) Great White Sharks. The biology of Carcharodon carcharias: 139–155.

The teeth of an adult white shark are broad, triangular, and finely serrated, allowing the animal to slice efficiently through flesh. Those of juveniles and of the lower jaw are generally narrower. When attacking large prey, the white shark often shakes its head violently from side to side, using its teeth like a serrated blade to tear away chunks of flesh.

In 2008 [1], a team of researchers estimated that the bite force of a 3,324-kg white shark reached 18,216 newtons (approximately 1,858 kgf)[2], one of the most powerful bite forces ever recorded in the animal kingdom.

Side note: Contrary to claims occasionally repeated in the media, there is no evidence that white sharks are responsible for the so-called “corkscrew wounds” observed on seals around Sable Island.

(1) Wroe, S., Huber, D. R., Lowry, M., McHenry, C., Moreno, K., Clausen, P., Ferrara, T. L., Cunningham, E., Dean, M. N., Summers, A. P. 2008. Three-dimensional computer analysis of white shark jaw mechanics: How hard can a great white bite? Journal of Zoology. 276 (4): 336–342.
(2) The kilogram-meter per second (kg·m/s or kg·m·s–1) is the standard unit of momentum . Reduced to base units in the International System of Units (SI), a kilogram-meter per second is the equivalent of a newton-second (N·s), which is the SI unit of impulse.

The white shark has one of the widest distributions of any shark species, ranging from subarctic waters to the tropics. In the Northwest Atlantic, it occurs from Newfoundland to Florida. It has even been recorded as far west as Rivière-Portneuf[1] in the St. Lawrence Estuary, roughly four hours downstream from Québec City. An opportunistic predator, the white shark readily enters shallow coastal waters in search of prey such as seals, occasionally bringing it close to areas frequented by residents and vacationers.

Despite the recent increase in documented sightings, the white shark is not a newcomer to the St. Lawrence. Mi’kmaq oral traditions, archaeological evidence, early explorer and missionary accounts, fisheries archives, and historical records all support the species’ long-term presence in eastern Canadian waters.

Until recently, white sharks appeared in the St. Lawrence only briefly, mainly from mid- to late summer. Today, however, seasonal incursions into the Gulf and Estuary generally extend from June to November and may in some years approach six months or longer. While climate change is not considered the primary reason for the species’ presence in the region, warming waters may have lengthened the period during which environmental conditions remain favourable.

The white shark is an opportunistic predator that feeds on just about anything in its path, whether dead or alive.

Verified stomach contents:

• Fish (partial list): Atlantic salmon, hake, halibut, mackerel, tuna, striped bass, other sharks and rays.
• Marine mammals: pinnipeds (seals), porpoises, dolphins, large cetaceans (generally carcasses).
• Other prey: seabirds, sea turtles.

The only confirmed natural predator of the white shark is the orca (Orcinus orca), which has repeatedly been observed hunting and killing white sharks in several parts of the world. For this reason, the St. Lawrence Shark Observatory generally refers to the white shark as a top predator rather than an apex predator, since the species is itself vulnerable to predation by orcas and is no match for them during such encounters.

Spectacular observations of orcas attacking white sharks, widely reported in the scientific literature and the media, led many people to attribute the decline of white sharks in South Africa primarily to orca predation. However, according to a recent study[1], this interpretation may have been overly simplistic. The authors suggest that shark nets, incidental mortality, and other human-related factors may have played a greater role than previously recognised, with orca predation potentially compounding the decline of an already vulnerable population rather than representing its sole or primary cause.

This distinction is also important in the context of the Gulf and Estuary of the St. Lawrence, where both the orca and the white shark have historically formed part of the native marine fauna[2,3]. While the orca is the white shark’s only confirmed natural predator, there is currently no evidence to suggest that it could prevent the recovery of the Northwest Atlantic white shark population or substantially limit the occurrence of white sharks in the region. Observations of orcas have nevertheless become more frequent and predictable during the last decade, particularly in the northeastern Gulf and off the south coast of Newfoundland, although they remain relatively uncommon. Encounters between these two large marine predators in the St. Lawrence are therefore still likely infrequent.

(1) Gennari, E., Hammerschlag, N., Fallows, C., Fallows, M., Andreotti, S., Chivell, W., Rutzen, M., Noble, B., Friend, R., & Edwards, L. (2025). White sharks under threats in South Africa: A call for precautionary management action. Endangered Species Research, 58, 409–416.
(2) Vladykov, V. D. (1944). Études sur les mammifères aquatiques III. Chasse, biologie et valeur économique du marsouin blanc ou béluga (Delphinapterus leucas) du fleuve et du golfe Saint-Laurent. Département des Pêcheries de la province de Québec.
(3) Wenzel, F. W., & Sears, R. (1988). A note on killer whales in the Gulf of St. Lawrence, including an account of an attack on a minke whale. Rit Fiskideildar, 11, 202–204.

White shark reproduction remains poorly understood. The species is ovoviviparous and reaches sexual maturity relatively late, at approximately 26 years of age for males and 36 years for females[1]. Birth has never been directly observed in the wild, but gestation is believed to last close to 12 months. Each litter is thought to contain between 4 and 14 pups, measuring approximately 135 to 151 cm at birth[2].

(1) Natanson Lisa J., Skomal Gregory B. (2015) Age and growth of the white shark, Carcharodon carcharias, in the western North Atlantic Ocean. Marine and Freshwater Research 66, 387-398.
(2) Castro, J. I. 2011. The Sharks of North America. Oxford University Press, 613 p.

A study[1] published in 2015 revealed that white sharks grow more slowly and live much longer than previously believed. The age and growth rate of the Northwest Atlantic population were estimated by counting vertebral growth bands and validating them through radiocarbon dating of eight specimens (four males and four females). The results suggested ages of up to 40 years for the largest female (526 cm) and as much as 73 years for the largest male (493 cm). These findings place the white shark among the longest-lived cartilaginous fishes (sharks, rays, and chimaeras) known, although still far behind the remarkably long-lived Greenland shark.

(1) Natanson Lisa J., Skomal Gregory B. (2015) Age and growth of the white shark, Carcharodon carcharias, in the western North Atlantic Ocean. Marine and Freshwater Research 66, 387-398.

According to the St. Lawrence Shark Observatory’s Canadian Shark Attack Registry, the white shark has been involved in, or suspected of, ten confirmed incidents involving humans in Canada. Historical accounts also suggest that, as far back as prehistoric times, white sharks may have attacked Mi’kmaq canoes. As of 2025, most documented encounters have involved small fishing boats in the Maritimes and Newfoundland during the last century.

In 1953, a man drowned after a white shark attacked his dory off Cape Breton. More recently, in 2021, a person was reportedly bitten by a white shark off Margaree Island in the Gulf of St. Lawrence, the only documented biting incident of this kind in Canada. In 2025, a paddleboarder (SUP) was knocked from his board off Cherry Hill Beach, Nova Scotia, after being struck by a white shark.

As white shark occurrence increases in Canadian waters, interactions with humans are also likely to become more frequent. Although attacks remain exceptionally rare, a combination of unfavourable factors, such as poor visibility, the presence of prey like seals, and simple chance, could lead to additional incidents in Atlantic Canada and Québec.

None. Although there is no directed fishery for the white shark in Canada, a number of specimens have nevertheless been captured accidentally since records began in the 19th century.

The white shark (Atlantic population) is listed as Endangered by COSEWIC (Committee on the Status of Endangered Wildlife in Canada) and has been protected under Canada’s Species at Risk Act (SARA) since 2011. Although recent studies and observations suggest a possible increase in occurrence in Atlantic Canada following conservation measures, the species remains considered at risk because of its low reproductive rate, slow growth, late maturity, and continuing vulnerability to human-caused mortality.

Globally, the white shark is classified as Vulnerable on the IUCN Red List and as Moderately Depleted under the IUCN Green Status framework, reflecting a species that has undergone major historical declines but is showing signs of partial recovery in some regions.