Why do salmon swim upstream to spawn?
Quick Answer
Salmon return to freshwater to lay eggs because their life cycle is split between ocean and river habitats. Many species also navigate back to their natal rivers using smell and other cues.
The Full Story
Salmon are born in freshwater, migrate to the ocean to grow, and then return upstream to reproduce. This journey ensures their eggs develop in river gravel, where oxygenated water can flow over them. Many salmon are strongly guided by olfactory cues, allowing them to home in on the river system where they were born. The migration is physically demanding and can involve jumping rapids and passing obstacles. It is one of the most dramatic life cycles in the animal kingdom and a major ecological event in northern rivers.
Key Facts
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