Young salmon learn the smell of their home stream, possibly even memorizing it at various points along the way, as they migrate toward the ocean. As adults returning to freshwater, when they encounter that familiar smell, it stimulates them to swim upstream.
Why do salmon swim upstream? The short answer to this is “to spawn”. Salmon are born in freshwater, usually in cool fast-flowing water. ... Sadly the effort of returning and fighting for territory and digging nests (known as 'redds') in the gravel wears them out so much that they usually die after spawning.
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| 01:00:00 0 |
COLOR BARS
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| 01:00:02 2.21 |
HIGH ANGLE LOOKING DOWN AT THE TOP OF A WATERFALL WITH MANY SALMON JUMPING UPSTREAM. SOME OF THE FISH MAKE IT TO THE TOP AND SOME DO NOT. KIND OF LOOKS LIKE THEY ARE HAVING FUN.
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| 01:01:47 107.22 |
BLACK BLANK DEAD AIR
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