Fin Whale: where and when to see them

The fin whale is the second-largest living animal, a streamlined baleen whale capable of travelling rapidly through open water. Its tall blow and long back may be visible from distant coastal viewpoints or vessel decks, although much of its life unfolds far offshore. Commercial whaling severely reduced many populations, and recovery is uneven. Ship strikes, entanglement, noise and changing prey distributions remain important threats across its broad but discontinuous global range.

Size

18–24 m long

Weight

40–80 tonnes

Lifespan

80–100 years

Status

Vulnerable

Fin whales occur alone, in small groups or in larger feeding aggregations where prey is concentrated. They engulf dense prey patches by expanding the pleated throat, then filter water through baleen. At the surface, the blow usually appears before the small dorsal fin far down the back. They rarely raise their tail flukes before descending. Seasonal movements vary among populations, and some regional groups remain within the same broad sea throughout the year. Fin whales are among the fastest cetaceans, often referred to as the 'greyhounds of the sea', capable of sustained speeds. They often travel in pairs or small family groups, though larger aggregations form around abundant food sources. Their blowhole is often visible before the back of the whale, offering an initial clue to their presence.

• The right lower jaw is pale while the left is dark.
• Only the blue whale grows larger.
• Their low-frequency calls can travel great distances through seawater.
• Fin whales usually descend without displaying their tail flukes.

The most practical window varies greatly by region: northern summer often suits North Atlantic observation, while Antarctic access concentrates in austral summer. Some populations, including those in the Gulf of California, are resident. Destination windows reflect access and viewing conditions, not universal migration dates. In locations like the Gulf of California, the late winter and spring often provide excellent viewing opportunities due to resident populations. Peak viewing seasons in the North Atlantic often coincide with summer phytoplankton blooms which support prey aggregations. For Antarctic cruises, the austral summer is the primary window when these whales concentrate in krill-rich waters.

Fin whales inhabit temperate, polar and some subtropical seas, using continental slopes, deep channels and productive offshore waters. They sometimes approach steep coasts where deep water lies nearby. This is a fully marine mammal, with shore visibility dependent on distance and sea conditions. They are generally found in offshore waters, favoring areas with high productivity and good prey availability. Though global in distribution, their presence is sparse in tropical and equatorial regions. Their adaptable nature allows them to thrive in diverse ocean environments, from ice-edged seas to warmer temperate zones.

They filter-feed on krill, schooling fish and other small marine prey, with regional differences in emphasis. Antarctic feeding is strongly associated with krill, while northern populations also consume fish such as herring and capelin. Feeding locations shift as prey patches move. Their feeding technique, known as lunge feeding, involves turning onto their right side to engulf prey patches. This specialized feeding strategy allows them to consume vast quantities of small organisms efficiently. In some areas, euphausiids (krill) form a substantial part of their diet, supplemented by copepods and small schooling fish.

Common name

Fin Whale

Scientific name

Balaenoptera physalus

Animal group

Marine life

Size

18–24 m long

Weight

40–80 tonnes

Lifespan

80–100 years

Status

Vulnerable

Identification

A long streamlined body, small swept dorsal fin and pale right lower jaw distinguish fin whales from stockier humpbacks and the usually smaller, differently marked sei and Bryde’s whales. The asymmetrical pigmentation, with a darker left side and a distinctive white or pale lower right jaw, is a key diagnostic feature. Their relatively small, falcate dorsal fin is set far back on their body, making them appear longer than other large whales. The chevron pattern visible behind the head and along the flanks further aids in distinguishing them from similar species.