Why Do Salmon Swim Upstream?
Why do salmon swim upstream?
Various salmon species are found to be present in the Atlantic Ocean and Pacific Ocean. The salmon fish are popular for their migratory nature. They are known to be migrating from small rivers to oceanic waters and then come back. They move from oceanic waters to rivers and then breed. While breeding they swim upside down. They stay in the ocean as long as they are sexually mature. The age at which they get matured sexually also is based on the species. Some of the salmon species move about 1400 kilometers distance from ocean to fresh waters. They lay eggs in fresh water and will do it mostly in high altitudes. They will have to fight with the strong currents in the river while swimming upstream.
As soon as the spawning is done, the fish will die as they are accustomed to salt waters and cannot tolerate the fresh waters for longer duration. They try to swim upstream as they want to breed at the same location where they were originated. As the salmon fish are born in fresh waters and later they move to salt waters, they swim upstream to reach the freshwaters in order to leave their eggs there. To move back from oceanic waters to fresh water, they need to go back or swim upstream while swimming downstream will make them to reach salt water from fresh waters.
The salmon will move upstream to spawn. The salmon fish will release eggs towards the surface waters. The newly born salmon fish will be in fresh water when they are born and they swim back to ocean waters four weeks after they are born. Soon after the salmon fish give birth to the babies, they die. The fish swim upstream only to reproduce the eggs. If they try to swim downstream, it may not help them to procreate effectively.
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