No. 1092 / 1 402

Lion's mane jellyfish

Cyanea capillata

名前について： It is named for its showy, trailing tentacles, which look like a lion's mane.1

痛いだけさわらないで痛いけど、大きな害はないよ。

クラゲと海の刺す生き物

刺す触手食べもの：肉

人への危険: 痛いすごく痛いこともあるけど、深刻になることはほとんどないよ。

The lion's mane jellyfish is one of the largest jellyfish known, and its bell can be over 2 m across in the far north. It lives in cold northern seas, including the English Channel, the North Sea and the Irish Sea. Its long, trailing stinging tentacles can wash up on beaches in late summer and autumn.1

すんでいる場所

Arctic, northern Atlantic and northern Pacific Oceans, including the English Channel, North Sea, Irish Sea and western Scandinavian waters1

北極海, 大西洋, 太平洋, 北海

ホーム

It stays mostly near the surface, at no more than 20 m deep, and drifts with ocean currents. Late summer and autumn are when most are seen, as currents sweep them onto beaches.1

長さ

50 cmから2.1 m (1.6 ftから6.9 ft)1

最高速度

時速約1.3 km（時速0.81マイル）

泳ぐ, おおまかな予想

何を食べるの？

It eats fish, zooplankton and smaller jellyfish. It uses its stinging tentacles to catch, pull in and eat its prey.1

Lion's mane jellyfishの写真 — Lion's mane jellyfish。写真：W.carter。 CC0, Wikimedia Commons.

見分け方

Bell is divided into eight lobes, giving it the look of an eight-point star1
Young ones are light orange or tan, darkening to red and purple as they grow1
Long, thin, trailing tentacles, with many more tentacles around the mouth1
Bell is often about 50 cm across in lower latitudes, and much larger in the far north1
Usually found alone, rarely in groups1

よくまちがえられるのは： The blue jellyfish (Cyanea lamarckii) is sometimes found in the same waters. It is blue rather than red, and smaller, with a bell of about 10 to 20 cm across.1

毒パワー

刺す触手

何かがふれると、何千もの小さな刺胞がいっせいに発射されるよ。

その毒（かむ・刺す毒）はどうなるの？

Its tentacles carry stinging cells, called nematocysts, which inject a sting when touched. The sting is very painful and feels like intense itching or burning, and it can cause temporary pain and redness where the skin was touched. Stings across large parts of the body can cause whole-body (systemic) effects, and medical attention is recommended in that case.1

人にとってどれくらい危険？

人への危険: 痛いすごく痛いこともあるけど、深刻になることはほとんどないよ。

Stings are not known to be fatal in healthy people, and there is normally no real danger, though people with special allergies may be at risk. Rare severe stings in deep water can cause panic, which may lead to drowning. In July 2010, about 150 beachgoers were stung by the remains of one broken-up jellyfish on a beach in New Hampshire, US.1

刺されたら

Vinegar can be used to deactivate the stinging cells. If you have touched a large number of tentacles, get medical attention after exposure.1
水から出て、触手を取りのぞこう（手袋か布を使って）。
熱帯のハコクラゲには：刺されたところに酢を少なくとも30秒かけて、助けを呼び、心肺蘇生（CPR）ができるようにしておこう。カツオノエボシやほとんどのクラゲには：海水で洗い流し、そのあと痛みにはお湯を。

まず必ず救急番号（112、000、911）に電話しよう。これは一般的な応急手当の案内で、医療のアドバイスではないよ。応急手当の基本

安全に過ごそう

野生の動物には、小さくても、ねているように見えても、死んでいるように見えても、ぜったいにさわったり、つかまえたり、からかったりしないこと。
近づかないで。出会ったら落ちついて、ゆっくりあとずさりして、そのまま行かせてあげよう。
刺されたら：落ちついて、じっとして、救急番号（112、000、911）に電話するか、急いで病院へ行こう。見た目をおぼえておいてね。写真があると役に立つよ。

きみをねらっているわけじゃないよ。毒はエサをとったり身を守ったりするために使うだけで、本当はかくれていたいんだ。安全に過ごすためにもっと知ろう

世界のどこ？

アフリカアジアヨーロッパ北アメリカ南アメリカオーストラリアとオセアニア太平洋大西洋北極海北海

どれくらい大きい？

どれくらい長い？

飼いネコ4匹を鼻からしっぽまでならべた長さバナナ12本をたてにならべた長さ大きなプール（50 m）を140秒で泳げる

Lion's mane jellyfishは、きみとくらべてどれくらい大きい？

ブラウザで計算しているだけ。何も保存されないし、どこにも送られないよ。

どれくらい速い？

カタツムリ 時速約0.05 km (0.03 mph)

Lion's mane jellyfish 時速約1.3 km (0.81 mph)

泳いでいる人 時速約3 km (1.9 mph)

知っておく価値あり

データ

The longest recorded tentacles were 36.6 m long, longer than a blue whale.1

Its tentacles can still sting for up to 25 days after they have detached from the jellyfish.1

Each of the eight lobes of its bell has about 70 to 150 tentacles, and it has around 1,200 tentacles near its mouth.1

The leatherback sea turtle feeds almost exclusively on lion's mane jellyfish in large numbers during summer around Eastern Canada.1

Unlike most jellyfish that drift in groups, the lion's mane is completely solitary.1

うそ・ほんとう

うそ： The lion's mane jellyfish is the longest animal in the world.

ほんとう： This claim was made on a TV show, but it was corrected. A bootlace worm reported in 1864 was said to be over 55 m long, and that report is doubted because bootlace worms can stretch well beyond their natural length. If that report is wrong, the lion's mane would be the longest animal.1

毒のエキスパート向け

学名: Cyanea capillata
グループ: クラゲと海の刺す生き物
家族: Cyaneidae2
ならびかえ: Semaeostomeae
大陸: 北極海, 大西洋, 太平洋, 北海, 海
赤ちゃん: The female carries fertilised eggs in a tentacle, and they grow into larvae that settle on a hard surface and become polyps, which then produce young jellyfish called ephyrae.1
寿命: 約1年1
人への危険: 2 / 5: 痛い3