I found some interesting info on carp:
People call them rough fish, and accuse them of eating walleye eggs and ruining ducks' food. Kids mutilate them and leave them to rot on the river bank. Bow hunters use them for target practice.
Is this any way to treat a fish that British and Russian anglers prize, a fish that is popular in European, Asian and southern U.S. cuisines? Carp is the most widely eaten fish in the world -- why do Northerners despise it?
Is carp too common for us? Do we distrust fish with mustaches?
Tom Dickson, carp fishing enthusiast and staff writer for the Minnesota Department of Natural Resources Fish and Wildlife Division said, "People up here have a prejudice against what they call rough fish -- carp, buffalo, gar and others. We don't even know why people call them 'rough'. It couldn"t be their scales, because the scales on a walleye are rougher than those on a buffalo fish."
Dickson has been working on this problem for a number of years. In 1990 he co-wrote a book with Rob Buffler called Fishing for Buffalo: A Guide to the Pursuit, Lore and Cuisine of Buffalo, Carp, Mooneye, Gar and Other Rough Fish, which sold well in Ohio, Arkansas, Tennessee and Missouri, where carp is the third most popular game fish, but it bombed in the North.
"Maybe in the North, we have so much other fishing we can pick and choose," Dickson speculated. "Maybe it's because people prefer walleye, which is a white, bland, boneless fillet that is easier to eat. Walleye tastes like tofu, in a way, compared to carp, which has more oil, like salmon or trout, which gives it more flavor. Carp is also more trouble to clean."
The oil is what may give carp a bad taste, too, if it has grown up in polluted water. Carp can and do survive in extremely polluted water, but they won't taste good.
In the early 1600s, Izaak Walton, the granddaddy of thoughtful anglers, devoted a chapter of his book The Compleat Angler to carp:
The Carp is the Queen of Rivers: a stately, good and very subtle fish. The Carp, if he have water-room and good feed, will grow to a very great bigness and length; I have heard, to be much above a yard long.
He is a very subtle fish, and hard to be caught. If you will fish for a Carp, you must put on a very large measure of patience, especially to fish for a River-Carp.
An old regulation said rough fish caught by hook and line could not be returned to the water, but this law was changed in 1981. There is no reason to remove such fish. There are too many carp for it to make a difference, and suckers, red horse, buffalo and other native fish are absolutely benign. "In fact, they're very sensitive. They cannot tolerate polluted water," Dickson said. Carp will uproot vegetation and cloud the water in shallow areas, blocking light and thus contributing to algae problems. But they do no harm to deep water, and they do not eat other fish or fish eggs, as has been rumored.
Commercial fishermen haul in several million pounds of carp from the Upper Mississippi River each year. Most is shipped east for processing. But this may change soon. Stories have surfaced lately about entrepreneurs who want to build carp processing plants on the banks of the Mississippi River near La Crosse.
If you'd like to read the rest of it look here--
https://answers.yahoo.com/question/index?qid=20080325160238AAci1r1