ナショナルジオグラフィックのインスタグラム(natgeo) - 2月1日 23時23分

Photograph by George Steinmetz @geosteinmetz Juvenile salmon instinctually swim upstream, even as they are pumped past a device to count and sort them by size. This new hatchery in Steinsvik, Norway, is the world's largest, producing more than five million salmon smolts annually. After they mature the fish are introduced to salt water before being put into pens in the fjord where they go from 200 grams to 5 kg, over 18 months. For an aerial view of the pens go to @geosteinmetz

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