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December 2010. Samoa would like to know if duckweed (Lemnoideae) is considered invasive. The reason for the interest is its potential as a feed for commercial egg and poultry farms.
There have been records of weediness of some species of Lemna, so it may be advisable to complete an assessment of risk.
http://interface.creative.auckland.ac.nz/database/species/references.asp?si=281&
fr=1&sts=sss&lang=EN
The Manager, Information Services, IUCN SSC Invasive Species Specialist Group, Regional Pacific Office, University of Auckland, New Zealand wrote: “Check references 2, 3, 4 and 5 of the aquatic plant profiles on the Global Invasive Species Database that has information on Lemna species but more importantly the weed risk model.”
http://www.issg.org/database/species/search.asp?sts=sss&st=sss&fr=1&Image1.x=37&Image1.y=10&sn=duckweed&rn=&hci=-1&ei=-1&lang=EN
However, it was said that duckweed is native to Samoa, but very uncommon. It would only become a problem if it were introduced into lakes (e.g. Lake Lanoto’o). It has been found in a small pond at Lefaga, and in the Manono Uta marsh, where it is harmless since there are so many marsh plants to shade it out, and little standing water.
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