V. spiralis is an "unwanted organism" in New Zealand.

Frequent hand washing remains the most important defense against the spread of unwanted organisms.

At sea and airports cargo, passengers and passenger baggage is checked for unwanted organisms.

If there is a threat of the spread of unwanted organisms within New Zealand containment measures are carried out.

Natural saltwater contains many unwanted organisms and pollutants.

The plastic sheath prevents the unwanted organisms from getting oxygen, and they die within three weeks, he said.

Failing to do so could result in a reversal of the desired effect, spewing unwanted organisms or chemicals into your drinking water.

Yet fish hooks are equally efficient at fastening to the enormous variety of unwanted organisms and objects that may intrude on the angling experience.

In New Zealand, wakame is declared as an unwanted organism.

This translates, for example, to two thousand pounds of unwanted organisms adhered to what was once a clean 10-pound fish pen net.