Higher demand for salmonids has prompted two operators to build hatcheries in Australia's state of Tasmania.

The industry's growth rate in the state is said to be at 15 percent a year.

Salmon farmer Tassal has announced plans for a AUS$16 million (US$15.47 million) hatchery, while Huon Aquaculture has just commissioned a AUS$7 million (US$6.77 million ) plant near Huonville, reports ABC rural.

Huon Aquaculture's hatchery uses a new closed-loop water recirculation system, and will provide one and a half million young salmon a year.