Rio Negro pygmy anchovy

📖 Overview

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.

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 0; Anal spines: 0; Anal soft rays: 12 - 14. 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.: elongated; Cross section: compressed.

🌀 Behaviour

Behavioural data for Rio Negro pygmy anchovy is currently being reviewed.

🦐 Diet

Diet information for Rio Negro pygmy anchovy is currently being compiled.

🥚 Reproduction

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

🌍 Habitat & Distribution

Freshwater; pelagic. Tropical; 0°S - 3°S South America: endemic to the Amazon system (Rio Jufari between Castanheiro Grande and Santa Fé, also Rio Negro at Santa Isabel).

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

🛡️ Conservation Assessment

📊 Population Risk & Fisheries

🔍 Similar Species

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 1 records indexed .

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