2.养殖投入品质差量少第一是目前水产养殖生产中使用的苗种质量普遍较低差,良种覆盖率不高且近亲繁殖十分普遍,使种质的抗病性下降,发病率增高。在引种和苗种移动过程中,缺乏有效的检疫和管理手段,使不健康的苗种、带毒苗种在生产上大量使用。种质检测机构、标准少,质量难以保 The second is the poor quality of aquaculture inputs The first is currently the poor quality of seedlings used in aquaculture production, low coverage of elite and inbreeding is very common, so that germplasm resistance decreased, the incidence increased. In the introduction and seed movement, the lack of effective quarantine and management tools, so that unhealthy seed, poisonous seed in the production of large-scale use. Germplasm testing agencies, standards, quality is difficult to protect