http://www.wetlandtrust.org.nz/symposia.html
and a good starter for you
http://www.nrc.govt.nz/upload/2217/Wetl ... 0Guide.pdf
i have a few pdf's on the subject if you need them
native fish habitats will be the way to go
and if you can talk the council into predator fencing it even better
you would then be able to breed brown teal etc in there