The state also ranks third in terms of channel catfish aquaculture, with about 19,200 acres (78 km2) under catfish farming in 2010. The peak of catfish farming in the state was in the year 2002, when 38,000 acres (150 km2) were under farming. In 2007, the state's catfish producers generated sales of $71.5 million – 16 percent of the total U.S. market.[16] Arkansas was the first state to develop commercial catfish farms in the late 1950s.