Disease-free

The New South Wales government plans to create a sanctuary in Sydney to preserve the country’s last-remaining disease-free koalas.

In addition to these protected sanctuaries, says Webster, there are also managed reserves, where diseased oysters are removed and replaced with disease-free hatchery seed. The oysters are allowed to grow until 60 percent of them are at least 10 centimeters long. Once the oysters have reached adult size, the reserves are opened up for harvest, supporting the commercial fishery.