一、问题的提出 目前的虾蟹类的育苗，绝大多数还是采用工厂化温室育苗。目前的育苗工艺绝大多数还是开放式、静水育苗，依靠大量换水来改善水质的传统育苗工艺。 １．传统育苗产生的弊端 （１）有机物多，水质差（特别是育苗后期），池底氧债高，沉积物黑臭。（２）换水量大， First, the issue raised At present, the nursery shrimp and crabs, the vast majority of factories or the use of greenhouse seedling. The vast majority of current nursery process is still open, hydrostatic nursery, relying on a large number of water changes to improve the water quality of the traditional nursery process. 1. The disadvantages of traditional nursery (1) more organic matter, poor water quality (especially late nursery), high oxygen debt at the bottom of the pool, sediment black and smelly. (2) a large amount of water change,