Anthelmintics/pharmacology; Diosgenin/analogs & derivatives; Fish Diseases/drug therapy; Helminthiasis, Animal/drug therapy; Magnoliopsida/chemistry; Platyhelminths/drug effects; Saponins/pharmacology; Animals; Anthelmintics/chemistry; Anthelmintics/isolation & purification; Anthelmintics/toxicity; Aquaculture; Biological Assay/veterinary; Carps; Diosgenin/chemistry; Diosgenin/isolation & purification; Diosgenin/pharmacology; Diosgenin/toxicity; Fish Diseases/parasitology; Helminthiasis, Animal/parasitology; Medicine, Chinese Traditional; Methanol/chemistry; Parasitic Sensitivity Tests/veterinary; Plant Extracts/chemistry; Plant Extracts/isolation & purification; Plant Extracts/pharmacology; Plants, Medicinal/chemistry; Rhizome/chemistry; Saponins/adverse effects; Saponins/chemistry; Saponins/isolation & purification; Saponins/toxicity