Carp in the United States are usually considered a bottom feeding garbage fish not to be eaten, while catfish are usually treated good table-fare, however, in Israel the catfish is not kosher for its lack of scales and so is rejected, but the carp with scales the number one fish produced by aquaculture. Catfish are known to eat just about anything including big globs of fetid flesh while carp with their small sucking mouths are much more omnivorous, from a clean aquaculture environment the superior fish to eat.
