Feral deer numbers are rising "markedly" and getting denser on the edge of high-conservation wilderness, according to a survey critics claim show a management failure.

Aerial mapping of the species in central and northeast Tasmania, released on Thursday, has revealed a jump in numbers from 53,660 in 2019 to 71,655 in 2024.

The report said deer had spread outwards since 2019 and their population become denser near high-value conservation areas near the Walls of Jerusalem National Park and Central Plateau.

The population's 33 per cent increase was marked and unexpected, it said.

Feral deer cost producers and the community $91 million nationally every year, a federal government action plan has found.

The Invasive Species Council, which estimates there could be 100,000 deer across 27 per

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