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 (动物界)	Animalia (动物界)
Phylum same	Chordata (脊索动物门)	Chordata (脊索动物门)
Class	Actinopterygii (Ray-finned Fish)	Mammalia (哺乳動物)
Order	Perciformes (鲈形目)	Carnivora (食肉目)
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. (脊索动物门)

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

大西洋蓝鳍金枪鱼（Thunnus thynnus）是世界上体型最大、游速最快、经济价值最高的鱼类之一，最大个体体重可超过600千克。该物种保护状态为濒危（EN），由于过度捕捞，其野生种群数量急剧下降，单条优质个体在日本拍卖市场上的成交价曾超过300万美元。

Polar bear

北极熊是地球上最大的陆地食肉动物，体重可超过700千克，分布于从加拿大到俄罗斯的北极海冰区。是高度特化的海洋哺乳动物，依赖海冰捕猎环斑海豹和髯海豹。是优秀的游泳者，能够横渡广阔的开阔水域。被列为易危种，因气候变化导致北极海冰迅速减少，种群正受到严重威胁。