一、选择优质种苗是关键购买体质好,抗病力和免疫力强,无病源的优质蟹种苗是无公害水产病害防治的关键。如何选择优质蟹苗?选购蟹苗时,一定要注意把好质量关,主要从五个方面来看:一看色泽,优质蟹苗一般为淡黄色或青灰色,色泽鲜亮。二看活力,优质蟹苗充满活力,用手抓一把松开后 First, the choice of high-quality seedlings is the key to buy a good constitution, disease resistance and immunity, disease-free high-quality crab seedlings pollution prevention and control of aquatic diseases is the key. How to choose high-quality crab? Purchase crabs, we must pay attention to the quality of the Guan, mainly from five aspects: a look at the color, high-quality crab seedlings generally pale yellow or blue-gray, bright color. Second, look at vitality, high-quality crab seedlings vibrant, with a hand after loosening