A new marine reserve has been established on Wellington's south coast, Conservation Minister Steve Chadwick said today.

The 854ha Taputeranga Marine Reserve takes in Owhiro and Island, Princess and Houghton Bays, and extends 2.3km out to sea and 3.3km along Wellington's south coast.

Fishing bans will come into force in 28 days time.

"Last year, more than 551 species -- including at least four new ones were discovered here, and the marine reserve will showcase this unique animal and plant-life," she said.

"The reserve will be an attraction for divers and snorkellers, wanting to view the naturally-restored ecosystems."

The marine boundaries were altered from those originally proposed to improve enforcement, and maintain opportunities for recreational and commercial fishers.

Wellington Branch of the Forest and Bird Protection Society and the Wellington South Coast Marine Reserve Coalition have been fighting for the reserve for 17 years.

Coalition spokesman Colin Ryder welcomed the announcement.

"Taputeranga Marine Reserve will be the equivalent of a national park on the city's boundary, and joins Karori Wildlife Sanctuary as a key part of Wellington's ecological infrastructure," he said.

Forest&Bird general manager Mike Britton also welcomed the announcement.

The official opening will kick off Conservation Week on September 7, and will include a marine walk with talks and activities between Island Bay and Owhiro Bay quarry. It is organised by Forest&Bird, Department of Conservation and others.