"Police believe we have now identified the man and our inquiries are ongoing to understand the circumstances of what occurred before he has entered the water in the vicinity of the ferry terminal,'' De Heer said.
The Herald understands the man involved was seen arguing with two people before he jumped into the water.
"We are still hoping to speak with two men who were seen talking to the man before he has gone into the water and ask them to contact police immediately.''
There have not been any travel alerts for delays issued by the Fullers Ferry services this morning.
However, several services to and from Waiheke were delayed early yesterday morning.
Other services were cancelled altogether and bus services put on later in the afternoon.
Can you help? Contact Auckland City Police: (09) 302 65567 or CrimeStoppers anonymous: 0800 555 111.