Harbour Porpoises are found in the Northern Hemisphere, and are often seen in BC throughout the year in fjords and inlets. They are one of two species of porpoise found in the waters off the coast of BC, the other is Dall's Porpoise.
Read more about the Harbour Porpoise at Wild Whales, the Vancouver Aquarium cetacean sightings site, and view a distribution map of BC sightings.
Species Information
Nicknamed the ‘puffing pig’ in eastern Canada, the harbour porpoise is British Columbia’s smallest cetacean. Living in the same waters as the well-known killer whale and the lively Dall’s porpoise, the harbour porpoise is often overlooked. It is quite likely that B.C. boaters pass near many harbour porpoises without even knowing they’re there. That’s because the harbour porpoise blends in very well with its marine environment. It is dark brown or gray in colour on its back, paler on its belly. Its body is chunky, with a small head, tiny
flippers and a low, triangular dorsal fin. Its mouthline is short and straight, tilting slightly upwards. Like all porpoises, it does not have much of a snout, or beak. Fully grown, harbour porpoises are about 1.8 metres
long and weigh about 90 kilograms.
Biology
Behaviour
Appearance is not the only reason harbour porpoises are hard to see. They are shy and normally try to avoid boats. They almost never ride the bow waves of boats and rarely, if ever, leap out of the water. They can swim at speeds of up to 20 km/h, but usually they travel quite slowly. On rough days they are almost impossible to spot.In calmer waters, the only signs they are there are their small dorsal fins and the sharp puffing sound of their breath. While it does not sound like a kind nickname, ‘puffing pig’ is an affectionate way to describe their travelling style.
Biology
Harbour porpoises are usually seen alone or in pairs. Occasionally, they may gather in groups of up to 20, but this is rare. In B.C., most calves are born between May and September. They are about 90 centimetres long at birth and likely stay with their mothers for at least six months.The harbour porpoise eats squid and a wide variety of small fish, such as herring. It uses its small, spade-shaped teeth to capture its prey, which it usually swallows whole.
Distribution
Global Range
Harbour porpoises are found in the colder oceans of the northern hemisphere. They are common year-round in coastal areas between central California and southern Alaska.
Distribution in British Columbia
As their name suggests, they are often seen in shallow inshore waters such as bays, river mouths, and harbours.
Conservation
Conservation Issues
Although the world population of harbour porpoises is unknown, their numbers are declining in some regions. They are listed as endangered in eastern Canada. There
is concern that their numbers are also falling in B.C. but it is not known how many there are. Because they prefer shallow coastal areas, harbour porpoises may be particularly sensitive to human activity. They sometimes become entangled in fishing nets and drown. Others may be driven out of their normal range by heavy boat traffic. And because harbour porpoises are high in the coastal food chain, their tissues can store high amounts of dangerous pollutants such
as PCBs and DDT.
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2021. E-Fauna BC:
Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab
for Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2023-09-25 7:32:21 PM]
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