Wildlife carers in Tasmania have released a white-bellied sea eagle back into the wild after nursing it back to health.

The three-year-old female was found at Cloudy Bay on Bruny Island nine weeks ago, unable to fly and in a distressed state.

Residents called for help and the bird was taken under the wing of the Raptor and Wildlife Refuge of Tasmania.

Craig Webb, who works at the refuge, said the eagle was in a bad way when it was found.

"Not really sure what happened, some serious bruising maybe," he said.

"My son and I went and rescued it and chased it around the mudflats in the lagoon, took it back to the raptor refuge.

"It's been recovering for about nine weeks [and] after about four weeks it started to fly again.

"We basically just supply a place of peace and tranquillity with the appropriate food and care that is required."

The white-bellied sea eagle Australia's second largest raptor

Australia's second largest raptor Wingspan 1.8 - 2.2 metres

Wingspan 1.8 - 2.2 metres Makes distinctive 'goose-like' honking sound

Makes distinctive 'goose-like' honking sound Found in Australia, New Guinea, Indonesia, China and India

Found in Australia, New Guinea, Indonesia, China and India Threatened species due to loss of habitat

"It has come good and we are really happy to able to release it.

"I believe it has recovered fully and it has just got to get its flight fitness ... the next week will be a bit of a test for it, hopefully it will not get picked on by other territorial sea eagles around here."

Hundreds of birds are cared for by the refuge every year and Mr Webb said most received injuries after hitting powerlines or wind turbines or were shot.

Local eco-tourism operator Rob Pennicott ferried the bird to its release point of the south-east coast.

His boat tours often sight the local wildlife, but Mr Pennicott said it was only the second time in the past 10 years he had been involved in an eagle release operation.

"Every bird is really important, but there is something about the majestic big eagles ... so definitely wedge-tail eagles and white-bellied eagles would be two of my favourites," he said.

The Tasmanian Parks and Wildlife Service said there were about 200 breeding pairs of the birds in Tasmania with each producing less than one offspring per year.

The Service lists the species as "secure" largely due to one fifth of the population living in wildlife reserves.