我国是世界上水产养殖大国。具有悠久的历史。随着养殖业的发展,目前面临四大问题:1.养殖水域环境条件恶化;2.水产养殖的种群混杂、种质退化、个体小型化;3.养殖结构布局不合理,养殖利润趋于下降;4.水产养殖业科技投入少,科技贮备不足。有关专家建议,我国水产养殖业存在的四大问题,必须引起人们极大关注,解决上述四 Our country is the largest aquaculture nation in the world. Has a long history. With the development of aquaculture, there are currently four major problems: 1. deterioration of environmental conditions in aquaculture waters; 2. aquaculture population mixed, germplasm deterioration, individual miniaturization; 3. irrational aquaculture structure layout, farming profit tends to decline ; 4 aquaculture technology investment in science and technology, inadequate. Experts suggested that the four major problems that exist in China’s aquaculture industry must arouse great attention to solve the above four