Man's body found at Melbourne marina

A man's body has been discovered at a popular marina in Melbourne.

A man's body has been pulled from the water at St Kilda Marina in Melbourne.

A passer-by spotted the body partially submerged in the sea opposite the boat marina about 1.20pm on Sunday.

Bystanders pulled the body out of the water before authorities arrived and police say the cause of death is yet to be determined..