Explain the Importance of female salmon digging a hole in bottom of the stream?

Female salmon creates the hole to rest after swimming upstream.

Female salmons create the hole where eggs are laid and fertilized by male sperm cells.

Female salmon uses the hole to attract male salmon,

Female salmon uses the hole to capture their food source.

Female salmons create the hole where eggs are laid and fertilized by male sperm cells.

Explanation:

Salmon are fishes which live in salt water oceans and fresh water streams. They return to their home stream and lay their eggs at the bottom of the stream by digging it. This is usually done by The female salmon turning on her side and beating the river bed with powerful sweeps of her tail. She does this until the hole is a foot and a half deep. She then lays the egg there which is then fertilized with speed by the male.

She then dies in the same place in which she was born about 5 years earlier.