Ctenopharyngodon idella is a native Chinese freshwater fish with a widespread distribution and considered one of the four Chinese major carps (among Hypophthalmichthys molitrix, H. nobilis, and Mylopharyngodon piceus). This species has been introduced into more than 50 countries throughout the world for aquatic weed control and aquaculture. In some countries, the Grass carp is an integral part of fish culture and forms an important source of protein for human consumption. Due to its success it is the third most commonly cultured species in the world. However, further research is needed on current farming conditions relating to reproduction without manipulation, aggregation, aggression, stress, and the current harvesting practices. Carp welfare can be improved using extensive culture systems promoting a natural habitat and behaviour of the species.
