- Scientific name: Boehlkea fredcochui
- Synonyms: Microbrycon cochui
- Common name: Blue tetra, Cochu's Blue Tetra
- Group: Characins
- Habitat: South America, Peru, Columbia
- Size: 5 cm
- Biotope: South American rivers.
- Social behavior: A lively, but peaceful, schooling fish. Can do well in community tanks with appropiate water and proper care. Will not eat plants.
- Diet: Omnivorous, small live food, and flakes.
- Breeding: Very hard
- Tank: Minimum 90 litres
- Population: 6-8 fishes for 120 litres
- Decoration: Peaty water, dark substate and low light level will show-off the fish in its best colors.
- Temperature: 22-26°C
- pH: 6-7
- Hardness: 5-12 NK°
- Lifespan: 3-4 years
Description: Often imported though it is difficult to ship: sensitive to shipping and requires considerable oxygen. The Blue tetra is an attractive fish: it has an elongated body, similar to that of the Neon Tetra, the base color is silver-blue with a broad blue stripe that runs from the gill cover through the caudal fin. The caudal fin is forked and colorless. The upper part of the iris is bright orange. In small or crowded aquarium, the Cochu's Blue Tetra will get frustrated and likely become aggressive towards other species of fish.
Lowering pH and water hardness a bit may induce breeding. The eggs are stuck under the leaves of plants. They are egg scatterers, so you should remove the parents after spawning. The eggs only hatch in soft water. The young fishes are very small and should be raised the first days with very fine infusoria.