Butis butis (Hamilton, 1822)
Duckbill sleeper
photo by Ratmuangkhwang, S.

 Family:  Eleotridae (Sleepers), subfamily: Butinae
 Max. size:  15 cm TL (male/unsexed)
 Environment:  demersal; pH range: 7 - 8; dH range: 9 - 19, amphidromous
 Distribution:  Indo-West Pacific: East Africa to Fiji (Ref. 6820).
 Diagnosis:  Dorsal spines (total): 7-7; Dorsal soft rays (total): 8-8; Anal spines: 1-1; Anal soft rays: 8-9. Dark longitudinal lines on body; caudal fin black with light margin dorsally; pectoral base with 1-2 black spots (Ref. 5493).
 Biology:  Inhabits brackish mangrove estuaries and lower reaches of freshwater streams, usually on mud bottoms (Ref. 44894). Usually found in lagoons and estuaries, particularly where there is vegetation (Ref. 6028, 79840). Occurs frequently in mangrove swamps (Ref. 2847, 79840). Occasionally ascends rivers (Ref. 6028). Feeds mainly on small fishes and crustaceans (Ref. 6028, 79840). Marketed fresh (Ref. 12693).
 IUCN Red List Status:   (Ref. 96402)
 Threat to humans:  harmless
 Country info:   
 

 Entered by: Sa-a, Pascualita - 14.05.93
 Modified by: Reyes, Rodolfo B. - 27.02.14
 Checked by: Sa-a, Pascualita - 11.07.94

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