Chitosan nanoparticle to carry vitamin C through the gastrointestinal tract and induce the non-specific immunity system of rainbow trout (Oncorhynchus mykiss)

► Chitosan nanoparticle has shown spherical shape and smooth surface. ► Chitosan nanoparticle could protect vitamin C through the gastrointestinal tract of rainbow trout. ► Chitosan nanoparticle could well provoke the non-specific immunity system.