Bottom spawner. Is very difficult to maintain in aquarium . Collected in clear water shallow pools (about 30 cm deep) in forest; no aquatic vegetation .
Dorsal soft rays (total): 15 - 17; Anal soft rays: 18 - 21; Vertebrae: 28 - 29. Possess an asymmetrical caudal fin, with convex dorsal outline and a straight ventral outline, anteriormost ventral procurrent ray; a white stripe with narrow ventral black border on the ventral edge of the caudal fin of male. Dorsal fin of male approximately triangular, tip pointed ending in 2 short filamentous rays with the tips reaching middle of caudal fin; dorsal fin rounded to slightly pointed in female. Anal fin of male approximately rectangular, posterior tip slightly elongated; rounded in female.: elongated; Cross section: oval.
Behavioural data for Marbled pearlfish is currently being reviewed.
Freshwater; benthopelagic; non-migratory. Tropical; 22°S - 23°S South America: Atlantic coastal river basins in Brazil.
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