Rio Negro Pygmy Anchovy

Mouth small, pre-maxillae absent or minute and toothless; maxilla very short, just reaching to front border of eye, with two supra-maxillae; articulation of lower jaw under hind border of pupil or just behind. Dorsal fin origin well behind midpoint of body; anal fin origin under first quarter of dorsal fin base. In life translucent or even transparent.

A female of 1.73 cm has 20 eggs in the single ovary in January.

Dorsal spines (total): 0; Analspines: 0; Analsoft rays: 12 - 14

Found some distance up a low-gradient swampy tributary of the Rio Negro and in the main river, in both cases the water generally darkly tinted, acidic and low in dissolved ions.

A riverine species collected some distance up a low-gradient swampy tributary of the Rio Negro (the Rio Jufari), Brazil and in the main river, in both cases the water generally darkly tinted, acid (pH 4-5) and low in dissolved ions. Feeds on dipteran larvae and pupae; also cladocerans. Males mature at 1.43-1.62 cm SL; females at 1.59-1.82 cm. Ovarian eggs are creamy or pale orange. A female of 1.73 cm had 20 eggs in the single ovary in January.

fisheries: of no interest