Cold Water
Giant Pacific Octopus
Enteroctopus dofleini · Cephalopod mollusk — family Enteroctopodidae; the largest octopus species known
The giant Pacific octopus is the largest octopus known, and meeting one at home in the emerald water of the Pacific Northwest ranks among cold-water diving's defining moments. An adult's arms can span a small room, yet the animal pours itself through den slots a fraction of that size; find the door by its midden, a fan of emptied crab and clam shells spilling down the spoil heap. Despite the scale it lives fast — a few years of relentless growth, one round of reproduction, and death, the female fasting for months while she guards and aerates tens of thousands of eggs. Encounters run from a watchful eye deep in a crevice to a bold animal walking the wall and tasting a diver's gear with sucker-lined arm tips. Let curiosity set the pace; never pull, pry, or crowd the den.
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 |
|---|---|---|---|
| British ColumbiaCanada | Resident — seen on most dives | 年間を通じて |
ベストな月、一目でわかる
| 月 | 安定して出会える目的地 |
|---|---|
| January | British Columbia |
| February | British Columbia |
| March | British Columbia |
| April | British Columbia |
| May | British Columbia |
| June | British Columbia |
| July | British Columbia |
| August | British Columbia |
| September | British Columbia |
| October | British Columbia |
| November | British Columbia |
| December | British Columbia |
理解を深める
ハビタット: Rocky reefs, walls, and boulder fields with den crevices, from the intertidal to well past diver depths in cold, emerald water.
分布域: North Pacific rim — from California through British Columbia and Alaska across to Japan and Korea.
生態・行動: Lives only a few years, growing relentlessly to one round of reproduction; the female guards and aerates tens of thousands of eggs without feeding until she dies. Individuals range from reclusive to boldly curious.
食性: Crabs, clams, shrimp, and fishes; the den is marked by a midden of emptied shells outside the entrance.
サイズ: 目安は 4.0 m; 確認済みの最大記録 6.0 m (arm-span tip to tip; big animals commonly weigh 15–20 kg, exceptional ones far more).
出会ったときの正しいふるまい方
Let curiosity run at the octopus's pace, keep hands out of dens, and skip lights in a brooding female's crevice — she cannot leave and stress costs her eggs.
保全
Least Concern; taken in some regional fisheries and as bycatch, with local protections in parts of the range.
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