Scalloped Hammerheadアカシュモクザメ

Sphyrna lewiniCR— Critically Endangered

The scalloped hammerhead (Sphyrna lewini) is a large hammerhead shark identified by the distinctive scalloped, curved margin of its head, found in warm temperate and tropical coastal waters worldwide, from the surface to over 500 m deep. It is a generalist predator of bony fish, cephalopods, crustaceans, and smaller sharks and rays, using its wide head to pin down prey such as stingrays, and gives birth to 12-41 live pups after roughly a year's gestation. Heavily targeted for the shark fin trade, its populations have collapsed by more than 90% in parts of its range, and it is classified Critically Endangered by the IUCN.

Scalloped Hammerhead (reference photo)
Photo: Barry Peters / CC BY 2.0 / Source / cropped

Species Data

Classification
Carcharhiniformes / Sphyrnidae Source
Distribution
Found worldwide from about 46°N to 36°S in warm temperate and tropical waters, from the surface to depths over 500 m, though most often above 25 m. Source

Did You Know?

  • The head's "hammer" has a curved central indentation flanked by two smaller notches on each side, giving it its scalloped profile. Source
  • When hunting stingrays, it uses its entire hammer-shaped head to pin the prey against the seafloor. Source
  • Gestation lasts about 12 months, with litters of 12-41 pups. Heavily targeted for the shark fin trade, Atlantic populations have declined by more than 95% over the past 30 years. Source

Where to See This Species

3 facilities · 0 individuals

のとじま臨海公園水族館 (Notojimarinkai Kouen Suizokukan)Ishikawa最寄り駅は和倉温泉駅。

のとじま臨海公園水族館のWikipedia記事に飼育種として記載 Source

Osaka Aquarium KaiyukanOsakaOpened in 1990

海遊館のWikipedia記事に飼育種として記載 Source

四国水族館 (Shikoku Suizokukan)Kagawa香川県綾歌郡宇多津町浜一番丁4（宇多津臨海公園内）。

四国水族館のWikipedia記事に飼育種として記載 Source

Conservation Story

Conservation Status

IUCNではCRに分類されています。

Habitat

熱帯・亜熱帯の沿岸から外洋。

Threats

  • ふかひれ目的を含む漁獲
  • 混獲
  • 沿岸生息地の劣化

Conservation & Breeding Efforts

  • 漁獲規制
  • 水族館での保全教育

Sources

ja.wikipedia.org

Support Conservation

A visit is a small, positive way to support the daily lives of the animals you care about.

Visit
A visit itself helps support the facility.
Animal Supporter Programs & Giving
Find ways to support the facility through its official website.
Furusato Nozei
Municipally run facilities may share official guidance for this Japanese hometown-tax program.

FAQ

Why is the scalloped hammerhead endangered?
It is heavily targeted for the shark fin trade; Atlantic populations alone have declined by more than 95% over the past 30 years. Source
How does the scalloped hammerhead hunt stingrays?
It uses its wide, hammer-shaped head to pin the stingray against the seafloor before biting it. Source
How many pups does a scalloped hammerhead have?
After a gestation of roughly 12 months, it gives birth to litters of 12 to 41 pups. Source

Source: ja.wikipedia.org en.wikipedia.org