Flagtail prochilodus
Semaprochilodus taeniurus
Also known as Flag-tailed prochilodus, Silver prochilodus, Flagtail
Care at a glance
- Temperature
- 73–82°F (23–28°C)
- pH
- 5.5–7.5
- Adult size
- 11.8 in (30 cm)
- Minimum tank
- 159 gal (600 L)
- Temperament
- Mostly peaceful
- Social behavior
- Social
- Swim level
- Middle
- Difficulty
- Medium
- Breeding
- No record
- Rarity
- Rare
- Origin
- Native to the central and upper Amazon basin in South America.
- Family
- Prochilodontidae
Overview
These active grazers need a large tank of several hundred liters and do best in a small group, since lone fish can be nervy and squabbly. They are peaceful toward tankmates but constantly busy, working over rocks, wood, and glass for algae. Provide strong flow and clean, well oxygenated water to mimic their river home.
In the wild
Ranges through large rivers and floodplains, moving into flooded forest with the seasons. It grazes on algae, detritus, and the soft film that coats submerged surfaces. Big schools make long migrations to spawn.
Good to know
Semaprochilodus taeniurus has a distinctive fleshy, sucker like mouth built for rasping algae and detritus from surfaces. Its clearest feature is the boldly striped tail that gives it the flagtail name. Adults reach around 30 cm.
Did you know
In the wild these fish gather in vast shoals and swim upriver to spawn, one of the great seasonal migrations of the Amazon.
Where to buy
Some links may not be the exact species or variety.
- LiveAquaria Freshwater and saltwater fish, inverts and corals
- Imperial Tropicals Freshwater fish and inverts bred at a Florida hatchery
…or ask your local fish store.
Appears in
Keeping Flagtail prochilodus?
Track water tests, reminders and stocking fit.
Related species

Kissing prochilodus
Semaprochilodus insignis13.8 in (35 cm)135 gal (510 L)73–84°F (23–29°C)
Streaked prochilodus
Prochilodus lineatus23.6 in (60 cm)396 gal (1,500 L)68–79°F (20–26°C)
African knifefish
Xenomystus nigri11.8 in (30 cm)53 gal (200 L)73–82°F (23–28°C)
Red tail barracuda
Acestrorhynchus falcatus11.8 in (30 cm)100 gal (380 L)72–82°F (22–28°C)
Silver tiger perch
Datnioides polota11.8 in (30 cm)79 gal (300 L)75–82°F (24–28°C)
Banded leporinus
Leporinus fasciatus10.6 in (27 cm)40 gal (150 L)68–82°F (20–28°C)