Atlantic Bluefin Tuna vs Polar bear

Thunnus thynnus compared with Ursus maritimus

Key Differences

• Atlantic Bluefin Tuna is Least Concern while Polar bear is Vulnerable.
• Polar bear is 1.8x heavier than Atlantic Bluefin Tuna.
• Atlantic Bluefin Tuna lives longer (40 years vs 25 years).

Taxonomic Classification

Rank	Atlantic Bluefin Tuna	Polar bear
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Actinopterygii (Ray-finned Fish)	Mammalia (Mammals)
Order	Perciformes (Perch-like Fish)	Carnivora (Carnivorans)
Family	Scombridae (Tunas & Mackerels)	Ursidae (Bears)
Genus	Thunnus (Tunas)	Ursus (Bears)
Species	Thunnus thynnus	Ursus maritimus

Evolutionary Relationship

Atlantic Bluefin Tuna and Polar bear share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Atlantic Bluefin Tuna

LC — Least Concern

Trend: Increasing ↑

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Atlantic Bluefin Tuna	Polar bear
Diet	Carnivore	Carnivore
Average Lifespan	40 years	25 years
Average Length	2.5 m	2.4 m
Average Weight	250.0 kg	450.0 kg

Habitat & Geographic Range

Atlantic Bluefin Tuna

Habitat

Found across multiple habitat types including temperate coniferous forests, montane grasslands and shrublands, and Mediterranean forests and woodlands within the Palearctic biogeographic realm.

Range

Distributed across Italy, Japan, Morocco, Spain, and United States.

Polar bear

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Atlantic Bluefin Tuna

The Atlantic bluefin tuna is one of the largest, fastest, and most valuable fish in the world. A single fish has sold for over $3 million.

Polar bear

The largest land carnivore on Earth, polar bears can exceed 700 kg and are found across Arctic sea ice from Canada to Russia. Highly specialized marine mammals that rely on sea ice to hunt ringed and bearded seals. Excellent swimmers capable of covering vast distances in open water. Listed as Vulnerable, with populations under severe pressure from rapid Arctic sea ice loss due to climate change.