Flagtail Prochilodus - 3.5"

Species Profile

• Scientific Name: Semaprochilodus insignis
• Common Name: Flagtail Prochilodus
• Adult Size: Up to 18 inches (45 cm)
• Life Expectancy: 8–10 years or more with proper care
• Habitat: Native to the Amazon and Orinoco River basins in South America. Found in fast-flowing rivers, floodplains, and streams with plenty of submerged vegetation and sandy or muddy substrates

Tank Requirements

• Minimum Tank Size: 180 gallons (681 liters) or larger due to their adult size and active swimming behavior
• Ideal Temperature: 75–82°F (24–28°C)
• pH Range: 6.0–7.5
• Water Hardness: Soft to moderately hard (4–15 dGH)
• Temperament: Generally peaceful but highly active; may stress or outcompete slower tankmates. Best kept singly or in a group of 3+ to reduce stress (if space allows)

Diet & Nutrition

• Omnivorous: Yes
• Diet: Primarily herbivorous in the wild; consumes algae, plant matter, and detritus. In captivity, accepts algae wafers, spirulina flakes, blanched vegetables (spinach, zucchini), and occasional protein (bloodworms, brine shrimp)

Appearance

• Coloration: Silver-gray body with a darker back and shimmering scales
• Fins: Tail (caudal fin) is boldly striped with alternating black and red/orange bands, resembling a flag—hence the name

• Body Shape: Laterally compressed with a downturned mouth adapted for grazing

Distinctive Features

• The striped tail fin is the most recognizable trait—resembles a flag and is often vivid in color
• Constant grazers, often seen nibbling surfaces throughout the tank
• Strong swimmers, requiring lots of open space and high oxygenation
• Excellent algae control, but must be fed supplemental plant-based foods to thrive