Found in a shallow (about 10 cm deep), slightly inclined swamp with slow water current, in open vegetation area .
Dorsal soft rays (total): 8 - 10; Anal soft rays: 12 - 14; Vertebrae: 29 - 30. Distinguished from all other species of the subgenus Melanorivulus in having small white spots forming a reticulate pattern on the dorsal fin and the basal part of the anal fin, and forming narrow bars on the caudal fin in males, and a narrow basihyal, width about 35% of the basihyal length. Can be diagnosed from all congeners by the unique combination of the following characters: entire flank with a continuous mid-lateral dark gray stripe; scales in longitudinal series 30-31; flank with close red dots, arranged in chevron-like series with the vertex on the mid-lateral line; and caudal fin in males with red bars .: elongated.
Behavioural data for Melanorivulus Paresi is currently being reviewed.
Freshwater; benthopelagic. Tropical South America: swampy floodplains of stream tributary to Sepotuba River, upper Paraguay River basin in central Brazil.
The following diseases are known to affect Melanorivulus Paresi.
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