Macrognathus aculeatus (Bloch, 1786)
Lesser spiny eel
Macrognathus aculeatus
photo by Roberts, T.R.

Family:  Mastacembelidae (Spiny eels)
Max. size:  38 cm TL (male/unsexed)
Environment:  benthopelagic; freshwater; brackish; pH range: 6.5 - 7.5; dH range: 15, potamodromous
Distribution:  Asia: Thailand, Malay Peninsula, Borneo and Indonesia. Reported from Bangladesh (Ref. 1479) and Nepal (Ref. 9496); India (Ref. 43634); Viet Nam (Ref. 89724).
Diagnosis:  Dorsal spines (total): 14-20; Dorsal soft rays (total): 52-56; Anal spines: 3-3; Anal soft rays: 50-54. Body with series of obliquely oriented bars (Ref. 39392). Dorsal and anal fins with a row of isolated spines followed by a long continuous soft portion, both fins extending to but not confluent with caudal fin. Pelvic fins absent. Caudal fin rounded (Ref. 4792).
Biology:  Adults occur in medium to large-sized rivers (Ref. 12975). Found in lowland wetlands and peats. Uncommonly seen in aquarium trades (Ref. 57235).
IUCN Red List Status: Least Concern (LC); Date assessed: 11 December 2019 Ref. (130435)
Threat to humans:  harmless


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