Fisheries Global Information System (part of the FAO) have produced a fact sheet on farming crucian carp (Carassius carassius).
Global production of farmed crucian carp was only 2977 tonnes in 1950 but had reached 1 702 778 tonnes by 2002, an increase of more than 572 times in 52 years. Crucian carp ranks 6th among all cultured freshwater fish globally and contributed 7.4% of the world freshwater aquaculture production in 2002. Most of the expansion was in China where the average annual growth rate between 1993 and 2002 was 21.6%/yr. Expansion in other countries has been much slower, due to the relatively small size and large number of fine inter-muscular bones, which make the fish less acceptable to consumers in many countries. Taiwan Province of China is another important producer; its annual production was maintained above 3000 tonnes/yr in the early 1980s (with a peak of 3764 tonnes in 1981) but has fluctuated wildly; from 1997-2002 it was in the 2000-2500 tonnes/yr range. Production in Japan, which has a long history of cultivating this species, is much less now than it was in the late 1960s.
The total value of cultured crucian carp production globally was US$ 1.20 billion in 2002, representing an APR of 15.4/yr. This apparently slower rate of expansion in value is mainly due to the devaluation of Chinese currency against the US dollar.