Cephalopods
Broadclub Cuttlefish
Sepia latimanus · Cephalopod mollusk — family Sepiidae; the largest cuttlefish on tropical Indo-Pacific reefs
The broadclub cuttlefish is the big, watchable cuttlefish of tropical reefs — second in size only to Australia's giant — and the one most likely to meet a diver's gaze with its strange W-shaped pupil and simply hold position, hovering on the ripple of its fin skirt. Its party piece is the passing cloud: bands of dark color strobing forward across face and arms while it stalks a crab, apparently dazzling the prey into stillness before the twin feeding tentacles fire. Individuals often tolerate long, close observation, cycling camouflage and curiosity in equal measure. In breeding aggregations males guard females and flash zebra patterns at rivals, sometimes courting on one body half while warning on the other. Eggs go deep into branching coral like clusters of white grapes. Approach slowly; ink means the show is over.
どこで・いつ見られるか
「常駐（Resident）」とは、そのダイビングスポットでのほとんどのダイブで遭遇できることを意味します。「季節限定（Seasonal）」とは、記載された月に確実に見られることを意味します。それ以外の出会いはボーナスであり、計画の前提にはなりません。
| 目的地 | 信頼性 | 月 | メモ |
|---|---|---|---|
| Sipadan & MabulMalaysia | Resident — seen on most dives | 年間を通じて | |
| Raja AmpatIndonesia | Resident — seen on most dives | 年間を通じて | |
| PalauPalau | Resident — seen on most dives | 年間を通じて | |
| Cairns & the Ribbon ReefsAustralia | Resident — seen on most dives | 年間を通じて | |
| Similan Islands & Richelieu RockThailand | Resident — seen on most dives | 年間を通じて | |
| MoalboalPhilippines | Resident — seen on most dives | 年間を通じて |
ベストな月、一目でわかる
理解を深める
ハビタット: Coral reefs and adjacent seagrass and rubble, hovering near branching coral where it hunts and breeds.
分布域: Indo-Pacific from the Andaman Sea through the Coral Triangle to northern Australia, Micronesia, and southern Japan.
生態・行動: Famous for the passing-cloud display — bands of dark color strobing forward over the face and arms to mesmerize prey; breeding males guard females and flash zebra patterns at rivals, sometimes displaying differently on each body half.
食性: Crabs, shrimp, and fishes struck with twin feeding tentacles after a slow stalk.
サイズ: 目安は 0.3 m; 確認済みの最大記録 0.5 m (mantle length; heavyweights reach roughly 10 kg).
出会ったときの正しいふるまい方
Move gently and stay to one side; a relaxed animal will hold position and cycle displays for minutes, while a startled one inks and the audience is over. Leave egg clusters in branching coral untouched.
保全
Formally Data Deficient; taken in reef fisheries across parts of the range, and breeding-season animals are conspicuously easy targets.
目撃情報で知られるダイブサイト
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