I am raising mosquitofish outdoors in 2,000 l fiberglass tanks in the Ever-
glades as part of an experiment involving mercury. I have had to dip net many
dragonfly naiads from those tanks to prevent great losses of fry. I realize
that netting of naiads might not work in your earthen ponds. Can you set up
a net cover over the ponds to prevent the female dragonfly from ovipositing?
That method has worked for many fish culturists.