アメリカ内務省のインスタグラム(usinterior) - 8月24日 00時10分

At Katmai National Park and Preserve in #Alaska, #salmon are the lifeblood of a fertile coastal ecosystem. At #BrooksFalls, the salmon must run a gauntlet of hungry bears, wolves, birds and other fish-eaters before proceeding further inland to spawn. Every summer, tens of thousands of sockeye salmon migrate from Bristol Bay to #spawn in rivers adjacent to large lakes, such as the #BrooksRiver, which connects Lake Brooks and Naknek Lake in the park. These homecoming salmon—weighing an average of 5-7 pounds—spend their first years of life in freshwater and their last 2-3 years in the ocean, where they attain the bulk of their mass. A #SockeyeSalmon fresh from the sea in July contains around 4,500 calories; a spawned out salmon in September may only have half that many. The Bears feast on them and turn into the celebrities from #FatBearWeek we all love. Video by Peter Pearsall, U.S. Fish and Wildlife Service. #USInterior

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