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Arctic cod spend winter beneath the sea ice.
北極鱈魚躲在海冰下面過冬。
Right across the Arctic Ocean, the fish play a major part in the food chain and bring rich pickings for all the marine mammals.
在整個北冰洋這種魚在食物鏈中占據著重要位置，為所有的海洋哺乳動物提供了豐富的食物。
As the ice melts, massive shoals gather along Greenland's west coast.
隨著冰層融化大量的魚群聚集在格陵蘭島西岸。
During the short summers of constant daylight, the Arctic Ocean burst into life.
在短暫的極晝夏日時光里，北冰洋迎來了生命的爆發期。
Millions of seabirds return to the Polar North to take advantage of the abundance of seafood.
幾百萬只海鳥飛回北極來享用這里豐富的海產。
The temperature of the water rarely rises above minus one degree Celsius, but the shallow seas of the Arctic are some of the earth's richest.
這里的水溫很少上升到攝氏零下一度以上，但北極的淺海區卻是地球上最富饒的海域之一。
These underwater life forms have made some remarkable adaptations to survive in the ice cold water.
這些水下生物對在冰冷的海水中生存已經顯現出某些不同尋常的適應性。
They are the same temperature as the water that surrounds them.
它們擁有與周圍海水相同的體溫。
And their survival depends on preventing ice crystals from forming in their bodies.
而它們的生存是依靠防止自己體內形成冰晶體。
Many produce special proteins in their blood that act as antifreeze.
許多動物在自己血液里產生特殊的蛋白質來作為防凍劑。
In summer, the powerful nonstop rays of the sun create a bloom of phytoplankton and microscopic plant life.
夏季時強力而持續的太陽光照使浮游植物生長旺盛，而微生植物也很興旺。
The phytoplankton trails the edge of the ice and can stretch for nearly fifty kilometers.
浮游植物沿著冰層的邊緣生長，綿延可達近五十公里。
For a few short month each year, they provide huge quantities of food for billions of invertebrates.
每年在短暫的幾個月時間里，它們為數十億無脊椎動物提供了大量的食物。
These crustaceans are vital element in the arctic food chain.
這些甲殼類動物是北極食物鏈中的關鍵一環。
And they form a stable diet of an arctic giant.
它們也是一種北極巨獸的穩定食物。
A bowhead whale eats nearly two thousand kilos of crustaceans everyday.
一頭弓頭鯨每天要吃近兩噸的甲殼類動物。
Weighing at over seventy thousand kilos, they can reach up to twenty meters of length.
它們體重可達七十噸以上體長可達二十米。
