Casting nets into a man-made fish pond at the Freshwater Fisheries Research and Training Centre at Kwangchow, near Canton. - - Fish Farming Techniques. The domestic raising of fish in village ponds has been practiced in China for more than 2,000 years. Carp, a fish rich in protein, has always been highly prized. Recent advances in fish culture techniques have been introduced to improve productivity. Although carp normally spawn in fast-flowing rivers, a method of artificial propagation has been developed to induce carp to spawn in ponds by injecting both male and female with an extract of carp pituitary gland (hormones). This and other techniques are demonstrated at the Government's Freshwater Fisheries Research and Training Centre at Kwangchow near Canton. Under FAO's Technical Cooperation Programme, the Government of Bangladesh has sent 50 Bangladeshi technicians to Kwangchow to learn new techniques in order to improve fish farming in their own country.