Negodagua tetra

Hyphessobrycon negodagua

Also known as Hasemania negodagua, Blacken King, ButterflyTetra, Nego dagua tetra

FreshwaterFish

Negodagua tetra (Hyphessobrycon negodagua) — The Wet Spot Tropical Fish · Used with permission

Care at a glance

Temperature: 68–79°F (20–26°C)
pH: 6.0–7.5
Adult size: 1.3 in (3.4 cm)
Minimum tank: 15 gal (55 L)
Temperament: Peaceful
Social behavior: Schooling
Swim level: Middle
Difficulty: Medium
Breeding: No record
Rarity: Rare
Origin: Upper Paraguacu basin, Chapada Diamantina, Bahia, Brazil
Family: Characidae

Overview

Keep six or more in an unheated-friendly setup if your room stays temperate; it prefers the cool end of tropical. It takes flake, granules, and frozen foods. Behavior recalls its silvertip cousin: active, tightly schooling, and a little bolder than the average rare tetra.

In the wild

This tetra lives in the upper Paraguacu basin in Bahia's Chapada Diamantina highlands, clear mountain-fed streams cooler than Amazon lowlands. Keep it at 20 to 26 degrees Celsius, pH 6.0 to 7.5, with current, rockwork or wood, and good oxygenation.

Good to know

Hyphessobrycon negodagua reaches about 3.4 centimeters and is endemic to the Paraguacu drainage. Current classification moves it to Hasemania, the genus of adipose-fin-less tetras that includes the silvertip, and it likewise lacks the little adipose fin most characins carry.

Did you know

Look closely and something is missing: like its silvertip relatives it has no adipose fin, the small second fin nearly every other tetra wears between dorsal and tail.