[BlueDragon]

Shock the river with DC voltage.

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 fish will be stunned and float to the surface. Then it’s a matter of scooping them up with nets.

The biologists use that very method when doing carp surveys. There are you-tube videos of it being done.

The culprit was birds with the carp eggs sticking to the bills and feet of the birds.

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.

[Lean-Right]

From what I’ve read there
are two species of carp
invading the Missouri river.
Big Head, and Silver carp.
They both prefer to spawn
in long stretches of fast
moving water, and basically
hatch on the move.
The silver carp are the ones
that get airborne due to boat
motor vibrations.