A person has reportedly disappeared into water during a fishing trip in Glenorchy.
A police spokeswoman said police were contacted at 3.15pm about an incident near Benmore Place in Glenorchy.
One person had reportedly gone into the lake while fishing, she said.
The person was reported to have been fishing near the shore before they went missing.
A search and rescue operation is underway supported by local resources to find the missing man.
"Every support possible has been summoned."
The Coastguard was on their way and a rescue helicopter was on standby.