This invention provides the application of
Usnea powder,
Usnea acid, or
sodium usneate (or
Usnea powder, Usnea acid, or
sodium usneate as the sole
active ingredient) in the preparation of broad-spectrum
antiparasitic drugs for aquatic animals, drugs for treating complications caused by parasitic infections, feed additives, or functional feeds. By utilizing Usnea,
Usnea extract, Usnea acid, and Usnea salts, various parasites, including ciliates, worms, and
protozoa, that infest the surface and interior of aquatic animals during
aquaculture can be eliminated or killed, thus maintaining the health of farmed animals, improving the success rate of
aquaculture, achieving broad-spectrum and highly effective prevention and control of
aquatic animal parasitic diseases, reducing the use of chemical drugs, and providing good
aquaculture, ecological, and
social benefits. It is safe, broad-spectrum, and highly effective, facilitating large-scale promotion.