🦈

Photo: Josh Hallett · CC BY 2.0

SpeciesCarcharhiniformesSphyrnidae

Sharks & rays

🦈Great hammerhead

Sphyrna mokarran (Rüppell, 1837)

ヒラシュモクザメ (平撞木鮫) Sphyrna mokarran は、シュモクザメ科に属するサメの一種。シュモクザメ科としては最大で、6.1 mに達することがある。全世界の熱帯沿岸に生息し、ハンマー型の頭部（”cephalofoil”）の前縁が直線になることが特徴である。鎌型をした高い背鰭を持つ。単独性の頂点捕食者で、甲殻類・頭足類や硬骨魚・軟骨魚など様々な動物を食べる。特にアカエイ科を好み、ハンマー型の頭部で押さえつけて捕食する姿が観察されている。胎生で、1年おきに最大55匹の仔を産む。潜在的に人に対して危険ではあるが、実際の攻撃例は少ない。フカヒレなどを目的に大量に漁獲されており、IUCNは保全状況を絶滅寸前としている。

Text: Wikipedia, CC BY-SA 4.0.

Videos

Photos

Measurements

vs you

≈ 7.2× your weight

Also called

Hammerhead Shark, Squat-headed Hammerhead Shark

Conservation status

CRCritically endangered

IUCN Red List assessment, 2019.

Population trendDecreasing

Key measurements

Body mass: 450 kg
Body length: 3.7 m
Shoulder height: not recorded
Top speed: not recorded
Bite force: not recorded
Maximum lifespan: 30 years

All measurements ↓

Facts and figures

Everything we know about the Great hammerhead

Typical adult figures. Where a value is an estimate rather than a measurement, it says so.

Body mass

450 kgmaximum recorded

FishBase

Details ↓

Source: FishBase · v25.04 · CC BY-NC 4.0

Body length

3.7 mrecord 6.1 m · FishBasetypical adult

FishBase

Details ↓

Record: largest individual on record

Source: FishBase · v25.04 · CC BY-NC 4.0

Maximum lifespan

30 yearsmaximum recorded

FishBase

Details ↓

Source: FishBase · v25.04 · CC BY-NC 4.0

Trophic level

4.32

FishBase

Details ↓

Source: FishBase · v25.04, estimate table · CC BY-NC 4.0

Diet

carnivoreaverage

Details ↓

From trophic level 4.32 (FishBase): <2.2 herbivore, 2.2–2.8 omnivore, >2.8 carnivore.

Danger to humans

other

FishBase

Details ↓

Source: FishBase · v25.04 · CC BY-NC 4.0

Volume l

450 Laverage

Details ↓

Body mass at ~1.0 kg/L, the density of vertebrate tissue.

average = a mean across sexes or species in a group.

Not recorded for Great hammerhead yet: shoulder height, top speed, bite force.

Where it sits

Family tree

Full lineage

All 8 branches ↓

kingdomMetazoa
phylumChordata
subphylumCraniata
subphylumVertebrata
superclassGnathostomata
classSharks & rays · Chondrichthyes
subclassElasmobranchii
genusSphyrna

More about the Great hammerhead

In other languages

Sphyrna mokarran (es), 无沟双髻鲨 (zh), Grand requin-marteau (fr), Sphyrna mokarran (pt), Гигантская акула-молот (ru), peix martell gegantina (ca) … and 20 more languages