自我国改革开放以来,广东省在发展淡水名优品种养殖方面,取得了巨大的成绩,在全国淡水养殖业处于举足轻重的地位。诸如鳜鱼、鳗鱼和罗氏沼虾等几个名优养殖品种的产量,分别占全国同类的总产量的71%、45%和68%(樊祥国,1995)。无论在养殖面积和产量方面,广东在全国均处于领先地位。然而,近年来,广东在发展淡水名优养 Since the reform and opening up of our country, Guangdong Province has made great achievements in the development of breeding of freshwater famous breeds and plays a decisive role in the nationwide freshwater aquaculture. The production of several well-known aquaculture species such as anchovy, eel and Macrobrachium ruminatum account for 71%, 45% and 68% of the national total respectively (Fan Xiangguo, 1995). Both in terms of farmed area and output, Guangdong is a leader in the country. However, in recent years, Guangdong is developing a reputation for freshwater