Crayfish feed additive as well as preparation method and application thereof

The invention relates to a crayfish feed additive as well as a preparation method and application thereof, and belongs to the technical field of crayfish breeding. The feed additive is prepared from the following raw materials: Chinese yam, astragalus membranaceus, selfheal, motherwort, isatis root and medlar. The various effective components contained in the feed additive can stimulate the development of immune organs of the crayfish, enhance the immunity and improve the immunity of the crayfish; meanwhile, the feed can also play a good role in regulating the digestive system function, metabolism and the like of the crayfish. Therefore, the growth of the crayfishes is promoted, the survival rate and weight gain rate of the crayfishes are improved, and the disease resistance of the crayfishes is improved. 本发明涉及一种小龙虾饲料添加剂及其制备方法与应用，属于小龙虾养殖技术领域。该饲料添加剂包括以下制备原料：山药、黄芪、夏枯草、益母草、板蓝根、枸杞。该饲料添加剂中所含的多种有效成分能够刺激小龙虾免疫器官的发育，增强免疫力，提高小龙虾的免疫力；同时还能够对小龙虾的消化系统功能、代谢等起到良好的调节作用。从而促进小龙虾生长，提高小龙虾的存活率和增重率，提高小龙虾的抗病能力。