Inhabits blackwater rivers and their seasonally inundated floodplain lakes and forests . Feeds on invertebrates .
Dorsal spines (total): 0; Dorsal soft rays (total): 0; Anal soft rays: 195 - 312. Body and head of living specimens uniformly black or very dark purple-brown with no humeral spot or patch; juveniles undergo striking pigmentation change from uniformly black by day to very pale with two distinct vertical saddle-like markings at night; dorsal margin of head well rounded (very convex) in adults .
Behavioural data for Sternopygus Obtusirostris is currently being reviewed.
Diet information for Sternopygus Obtusirostris is currently being compiled.
Reproduction data for Sternopygus Obtusirostris is currently being compiled.
Freshwater; benthopelagic; pH range: 3.0 - 6.0. Tropical South America: main stem of Amazon River, lower Negro River basin in Brazil.
invertebrates (Ref
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