I do agee that carp do tend disturb the bottom
of a lake,pond or river,when they feed on the
roots of aquatic plants. That tend to make the
water muddy.
I don't eat carp here,in the U.S.,I usually
kill the carp and feed the rest of wildlife on their
bodies. Also I seen people who use jugs for
going after large catfish,used small to meduim
sized carp for bait.
That is all that they are good for. Other than
than colored varieties known as Koi,for the pet
trade. And food for the otters,raccoons and
minks along the shores of our waterways.

Trouter