Inhabits all types of water. Juveniles occur exclusively in very soft and acid, clear and black water while sub-adults occur in whitewater brooks .
Dorsal spines (total): 15 - 16; Dorsal soft rays (total): 6 - 7; Anal spines: 3; Anal soft rays: 6 - 7. Can be distinguished readily by having three rows of round to vertical-ovoid, alternating dark grey to blackish, double or triple spots on the sides of the body; adult males with a black spot on the dorsum and basal part of the dorsal fin at the position of hard rays 7 to 8, and a pointed rhombic caudal fin. Exhibits pronounced sexual size and color dimorphism .: elongated.
Behavioural data for Dicrossus Foirni is currently being reviewed.
Diet information for Dicrossus Foirni is currently being compiled.
Reproduction data for Dicrossus Foirni is currently being compiled.
Freshwater; benthopelagic. Tropical South America: Rio Negro, Amazon drainage in Brazil.
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