Shock the river with
DC voltage. The fish
will be stunned and
float to the surface.
Then it’s a matter of
scooping them up with
nets.
We did this on our stock
ponds (using an old crank
style phone) to rid the
ponds of carp.
We contacted a fish biologist
while trying to figure out
how the carp infested the
ponds to begin with. The
culprit was birds with the
carp eggs sticking to the
bills and feet of the birds.
Then would land from pond
to pond, distributing the
carp eggs. We couldn’t stop
the birds, so we shocked
the ponds once a year.
We stocked the ponds with
bluegill and large mouth bass.
After a few minutes, the stocked
fish would “wake up” and swim off.
Some years back an electric fence of sorts was installed in the upper reaches of the Illinois River, right below the last lock -- I think.
The biologists use that very method when doing carp surveys. There are you-tube videos of it being done.
You must be talking about common carp?
I've been wondering if the Asian carp can spread to waters they are not contiguous with in similar manner, but don't know much of anything about how they spawn, when and where it's preffered by the Asian type, etc.
Both my daughter and one of their neighbors dug farm ponds which were soon populated with a variety of fish.
Neither “planted them in their ponds.
We, too, figured it had to have been birds because there was no connection to another waterway.
SO, stopping the “invasion” just ain’t a gonna work.