Salmon breed againist the turbulant water.
In order to breed, many salmon species swim upstream ,facing turbulant waters along the way.
How are they endure a grueling journey without succumbing to exhaustion?tThey sacrifieces their life for their baby.
Salmon have a spetial ability. They use the vortics and bend their body not to use their energy. 
The fish curve their bodies to side to side and use the whirlpool. Their skill is very sprended. When they reached the river, upstreams ,they breed. The place is not so dangerous for their babies.And they die.I don't know the reason. But nature is sprended.
In order to breed, many salmon species swim upstream ,facing turbulant waters along the way.
How are they endure a grueling journey without succumbing to exhaustion?tThey sacrifieces their life for their baby. Salmon have a spetial ability. They use the vortics and bend their body not to use their energy. The fish curve their bodies to side to side and use the whirlpool. Their skill is very sprended. When they reached the river, upstreams ,they breed. The place is not so dangerous for their babies.And they die.I don't know the reason. But nature is sprended.