Scientific Name
Polydactylus microstomus  
Polydactylus microstomus小口多指馬鮁
by: Lab of Fish Ecol. and Evo., BRCAS
Author (Bleeker, 1851) Depth 1 - 30M
Chinese 小口多指馬鮁 Poisonous Fish No 
Family_Chinese 馬鮁科 Economic Fish Yes 
Family F380 Polynemidae Edible Fish Yes  Chinese In Mainland China 小口多指馬鮁 
Max Length 25 cm  Aquarium Fish No  Common Name 午仔 
Distribution in World India Ocean to West Pacific Ocean   Distribution in Taiwan South 
Habitats Benthos、Coastal  Holotype Locality Celebes 
Synonyms Polyactylus microstomus, Polydactylus microstoma, Polydactylus plebeius, Polydactylus sextarius, Polydactylus zophomus, Polynemus microstoma, Polynemus microstomus   
Reference 臺灣魚類誌(沈等, 1993);The Live Marine Resources of the Western Central Pacific, Vol.5(FAO, 2001)  沈世傑 編 Shih-Chieh Shen ed. 1993 Motomura, H. etc. 1999 
Specimen List ASIZP0802624. FRIP00881. FRIP22109. NMMBP01000. NTUM02332. NTUM04120. NTUM06260. NTUM06951. NTUM07605.  
Common Name Smallmouth threadfin; Small-mouthed threadfin; Thread fish 
Redlist Status NL Not in IUCN Redlist     
Characteristic A small species; body deep. eye diameter greater than snout length. Snout pointed; posterior margin of maxilla rounded, not deep. Vomer edentate; anterior of tooth patch on palatine with medial arm; ectopterygoid tooth patch small; width of band of teeth on premaxillae less than 2 times in space separating band of teeth on one premaxilla from other. Posterior margin of preopercle with less than 53 serrations. Gill rakers on first gill arch 25 to 35. First dorsal fin with VIII spines; second dorsal fin with I spine and 12 or 13 soft rays; anal fin with III spines and 10 to 13 soft rays; pectoral fins insert low on body; pectoral fins with 12 to 15 rays, rays short, 17-20% of SL; all rays branched except uppermost 1 or 2; with 5 pectoral filaments, uppermost not reaching to (or extending slightly beyond) posterior tip of pectoral fin. Lateral-line scales 42 to 50. Body white, with metallic golden and green reflections; black spot behind opercle covers about second through eighth lateral-line scales and diffusing over 1 row above and below; dorsal and caudal fins a pale dusky green; pectoral, pelvic, and anal fins dusky, with wash of yellow; pectoral fins dark mostly on medial surface and dorsolaterally.
habitats Occurs mainly over shallow muddy and sandy bottoms of the continental shelf.Feeds mainly on small crustaceans (especially shrimps), fishes and benthic organisms. 
Distribution Commonly distributed in Indo-West Pacific from southeast India, Sri Lanka, northeast Bay of Bengal; Taiwan south through the Philippines, Borneo, eastern Indonesia, and to eastern New Guinea, New Caledonia and Fiji. It is found in southern Taiwanese water 
Utility Marketed fresh.