【動画】LASBOS card 051

Giant Pacific octopus
Enteroctopus dofleini

The Giant Pacific octopus is the world's largest octopus, reaching over 40 kg in weight. It is widely distributed in the cold waters of the Northern Hemisphere from North America to Asia; in Japan, it is mainly found in Hokkaido and northern Honshu. It is an important fishery resource in Hokkaido, with an average annual catch of approximately 15,000 tons. It is a cold-water octopus, preferring water temperatures below 15^oC. When the surface water temperature of the Tsugaru Strait rises in summer, they move to deeper areas to avoid the high water temperatures. They then return to shallower areas in fall when waters cool. Its maximum lifespan is 4-5 years. Check out these beautiful underwater videos (with commentary) that capture the physiology and ecology of the Giant Pacific octopus .

学名：Enteroctopus dofleini

　ミズダコは体重40㎏以上になる世界最大のタコです。北米からアジアまでの北半球の冷水域に広く分布します。日本では主に北海道と本州北部に多く生息しています。北海道の重要な漁業資源で、年間平均漁獲量は約１万５千トンです。ミズダコは冷水性で、15℃以下の水温を好みます。夏に津軽海峡の表面水温が上昇すると、高水温を避けるために深い場所へ移動します。そして、水温が下がり始める秋に再び浅い場所へ移動します。最大寿命は４～５年です。ミズダコの生理・生態を捉えた美しい海中映像（解説付き）をご覧ください。