The invention relates to a composite preparation for preventing and treating
water retention disease of river crab and application thereof, and belongs to the technical field of
aquaculture. The main ingredients comprise ginger
powder, Folium Isatidis, fennel and
cassia twig. The preparation method of the preparation comprises the steps of weighing and taking the ingredient based on a certain proportion, decocting the ingredients with water, screening out the residue, cooling, mixing the solution with lauryl
sodium sulfate, bacillus composite and
iodine methionine in weight proportion ratio to make the composite preparation. The preparation uses a variety of
traditional Chinese medicine plant sources which are safe and harmless to the river crabs with the auxiliary substances of activating agent, microorganisms and
iodine and the like. The functions of live protection,
bacteria inhibition,
growth promotion,
digestion promotion,
disease prevention and resistance are integrated. The ingredients are selected with definite purposes. The effect is stable. The preparation can be directly spread with convenience in application. The
bioavailability is high. The application of the preparation is not affected by the environment. After the application, the
ecological environment for the river crab culture can be restored quickly. The preparation can effectively inhibit the causal organisms in the
culture environment, improve the damaged tissues of the crabs, strengthen intestinal tract digestive ability, reduce the
water retention disease of river crab caused by functional degradation of crab
organic body, boost the growth, and enhance the culture yield and quality of the river crabs.