Scientific Name
Desmodema polystictum  
Desmodema polystictum多斑扇尾魚
by: Lab of Fish Ecol. and Evo., BRCAS
Author (Ogilby, 1898) Depth 0 - 500M
Chinese 多斑扇尾魚 Poisonous Fish No 
Family_Chinese 粗鰭魚科 Economic Fish Yes 
Family F206 Trachipteridae Edible Fish Yes  Chinese In Mainland China 多斑扇尾魚 
Max Length 110 cm  Aquarium Fish No  Common Name 粗鰭魚、白龍魚(澎湖) 
Distribution in World global   Distribution in Taiwan North 
Habitats Ocean、Deep Sea、Coastal  Holotype Locality Off Newcastle, New South Wales, Australia [Tasman Sea, southwestern Pacific] 
Synonyms Trachipterus misakiensis, Trachipterus polystictus, Trachipterus woodi, Trachypterus jacksoniensis polystictus, Trachypterus misakiensis   
Reference 臺灣魚類誌(沈等, 1993);Fishes of Japan(Nakabo, 2002)  沈世傑 編 Shih-Chieh Shen ed. 1993 Nakabo T. 2002 
Specimen List ASIZP0057405. ASIZP0065470. FRIP01148. NMMBP00891.  
Common Name Polkadot ribbonfish; Polka-dot ribbonfish; Spotted ribbonfish; Dealfish 
Redlist Status NL Not in IUCN Redlist     
Characteristic Body elongate, ribbon-like, compressed; body depth gradually decreasing from head to caudal peduncle. Head small. Snout length shorter eye diameter. Pointed teeth on jaws, vomer, and palatines. Scales present in juveniles; absent in adult. Dorsal fin very long, extending along entire body length to tail, with 116-131 rays; anterior dorsal-fin rays elongate in juveniles, reduced in adult; anal fin absent; pelvic fins with 7-10 rays, elongate in juveniles, and absent in adult; caudal fin without 2 lobes and not sharply upturned. Head and body usually silver; specimens less than 10 cm with many dark spots.
habitats Mesopelagic species, sometimes drifting to coastal regions. Feeds upon various organisms like small fish, squids, octopus, and crustaceans. The eggs are free-floating, large, and red. 
Distribution Probably circumtropical. It very rare and only found in northern Taiwanese waters. 
Utility No commercial importance.