Freshwater crustaceans and freshwater molluscs had peaks in the early 2000s and mid-1990s, respectively, but after periods of decreasing catches, they have been relatively stable since 2010 at 0.45 and 0.36 million tonnes. The first-sale value, re-estimated with newly available information for some major producing countries, is considerably higher than previous estimates. In general, FAO's data for aquaculture production volume are more accurate and reliable than those for value.