Inland fisheries enhancement and constraints: China.
China has increased production of freshwater fish mainly through the development of cage and pen culture in rivers, lakes and reservoirs, plus the establishment of introduced species. Typically, in Lake Gehu, Jiangsu Province, declining production of native fish has been supplemented by the rearing of cultured fish in specified areas of the Lake. Other zones of this lake are reserved for conservation and natural production of fish. Although some improvements in deteriorating fisheries have been achieved by the application of such management practices, the main compensation for losses of natural production is through the development of aquaculture. Long stretches in the lower reaches of the major rivers are now so polluted that they no longer either support fish or sustain their reproduction.