Steller Sea Lionトド
Eumetopias jubatusNT— Near Threatened
The Steller sea lion is the largest of the eared seals, ranging across the North Pacific from California to Japan. It hauls out on rocky coastlines by day and forages for fish and cephalopods at night, and males form defended breeding harems each summer. The IUCN lists the species as Near Threatened, reflecting a severe historical decline in its western stock alongside recovery in the east.
Steller Sea Lion (reference photo)
Species Data
Did You Know?
- It is the largest of the eared seals, and among all pinnipeds is exceeded in size only by a few species such as the walrus and elephant seals. Source
- During the breeding season, males establish and defend territorial harems, often fasting for extended periods while guarding their females. Source
- In Japanese waters, the species causes significant fishery damage, with annual losses exceeding one billion yen reported since 1992, even as the local population has declined. Source
Where to See This Species
7 facilities · 0 individuals
小樽水族館 (Otaru Suizokukan)HokkaidoOpened in 1958
海獣公園でトドのショーを実施し、飼育・生態研究を行う。 Source
Kamogawa Sea WorldChiba東京駅から特急わかしおで約2時間、JR「安房鴨川」駅下車後、無料送迎バス（西口バス停発）で約10分。
展示エリア「トドの海」で展示。 Source
ふくしま海洋科学館 (Fukushimakaiyoukagakukan)FukushimaOpened in 2000
ふくしま海洋科学館のWikipedia記事に飼育種として記載 Source
宮島水族館 (Miyajima Suizokukan)HiroshimaOpened in 2011
宮島水族館のWikipedia記事に飼育種として記載 Source
桂浜水族館 (Katsurahama Suizokukan)KochiOpened in 1931
桂浜水族館のWikipedia記事に飼育種として記載 Source
城崎マリンワールド (Kinosakimarin World)HyogoJR城崎温泉駅から全但バスで約10分「日和山（マリンワールド）」バス停下車。
城崎マリンワールドのWikipedia記事に飼育種として記載 Source
Toba AquariumMieOpened in 1955
鳥羽水族館のWikipedia記事に飼育種として記載 Source
Source links to official sites, official YouTube channels, and news aggregators such as Zoo Ring. Visit the publisher for the full item.
Conservation Story
Conservation Status
IUCNでは準絶滅危惧(NT)。西部個体群は1970年代以降激減し米国では絶滅危惧種に指定された一方、東部個体群は回復し2013年に指定解除された。
Habitat
北太平洋の岩礁沿岸域、ベーリング海・オホーツク海を含む寒冷な沿岸海域。
Threats
- 西部個体群における餌となる魚類の減少(いわゆる「ジャンクフード仮説」)
- シャチによる捕食圧の増加
- 漁業との競合・混獲
- 日本近海では漁業被害を理由とした駆除
Conservation & Breeding Efforts
- 米国・ロシアの海産哺乳類保護法による意図的捕殺の禁止
- アラスカを中心とした個体群モニタリングと研究
- 日本における個体数・被害状況の継続調査
Sources
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FAQ
- How big are Steller sea lions?
- They are the largest eared seals, with males averaging around 3 meters long and weighing up to 1,120 kg, far larger than females. Source
- Are Steller sea lions endangered?
- The IUCN lists them as Near Threatened. The western stock in the North Pacific declined severely from the 1970s onward, while the eastern stock has recovered enough to be delisted from US endangered species protection. Source
- What do Steller sea lions eat?
- They are opportunistic feeders on fish such as pollock, herring, capelin, and flatfish, as well as squid and octopus. Source
Source: ja.wikipedia.org en.wikipedia.org www.iucnredlist.org