they area traditional Jewish delicacy. My mother has bought them in chinatown so she could make it like her grandmother used to. Its a very oily fish, but once ground and made into a loaf with onions carrots and bread crnumbs it tastes like a cake almost. It is called gefilte fish. You can buy it in a Jewish store, frozen and ready made.When I was a kid there was a Jewish family that lived behind us, a fairly wealthy couple, who asked me to keep all the carp that I caught (in the Detroit River circa 1970 - yuck) and they ate them with great pleasure.