1.前言“种”是养殖业的物质基础。优良的种苗对水产养殖产量的提高和品质的改善,起着重要作用。然而,随着水产养殖业的不断发展,苗种仍然是制约水产品养殖产量的一个重要因素。目前水产业的良种普及率还很低,特别是经过选育的良种还很少。而且有相当一部分养殖品种因为没有严 1. Introduction “Species” is the material basis of aquaculture. Good seedlings play an important role in raising aquaculture yields and improving quality. However, with the continuous development of aquaculture, seedling is still an important factor restricting aquaculture production. At present, the penetration rate of the seed of the aquaculture industry is still very low, especially after thoroughbred breeding. And there is a considerable part of breeding species because there is no strict