(一)选择品质优良、健康不带病的鱼苗由于我国的鱼苗生产场几乎都是承包经营,各场家的生产规模、硬件设施、技术水平和经营理念千差万别,亲本良莠不齐,导致鱼苗市场恶性竞争,品质鱼龙混杂,最典型的如罗非鱼苗、鲤鱼苗、鲫鱼苗,不仅品种繁多、来源复杂,而且有些是杂种二代、三代作亲本繁殖出来的,品质退化,抗逆性差,成活率低。加之不少地县的检疫机构工作失职,生产 (A) the choice of good quality, healthy and disease-free fry As China’s fry production are almost always contracted management, the market size of the production facilities, hardware facilities, technical level and business philosophy vary greatly, the parents mixed, leading to a vicious competition fry market , The quality of quite a mixed bag, the most typical such as tilapia seedlings, carp fry, crucian carp, not only variety, complex source, and some are hybrid second-generation, three generations of parents to breed out of quality degradation, poor resistance, low survival rate. In addition, many prefectural quarantine agencies work dereliction of duty, production