Flagfish - Jordanella floridae

Scientific name: Jordanella floridae

Common name: Flagfish

Family: Cyprinodontidae

Usual size in fish tanks: 6 - 7 cm (2.36 - 2.76 inch)

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Recommended pH range for the species: 6.7 - 8.2

Recommended water hardness (dGH): 12 - 18°N (214.29 - 321.43ppm)

0°C 32°F30°C 86°F

Recommended temperature: 19 - 23 °C (66.2 - 73.4°F)

The way how these fish reproduce: Spawning

Where the species comes from: North America

Temperament to its own species: peaceful

Temperament toward other fish species: peaceful

Usual place in the tank: Middle levels

Overview

The Flagfish (Jordanella floridae) is a small, peaceful freshwater fish native to North America. Known for its striking coloration and algae-eating abilities, it is an excellent addition to a well-maintained aquarium. These fish are resilient and thrive in various water conditions, making them suitable for both beginner and experienced aquarists.

Origin and Natural Habitat

Flagfish are native to North America, specifically around Florida and the Gulf Coast. They inhabit slow-moving freshwater environments such as marshes, ponds, and ditches, where they graze on algae and plant matter.

Appearance and Size

These fish grow to a size of approximately 6 - 7 cm (2.36 - 2.76 inches). Males display a colorful pattern resembling the American flag, which gives them their common name, while females have a more subdued coloration and a rounder body shape.

Tank Requirements

• Tank Size: A minimum of 40 liters (~10 gallons) is recommended for a small group.
• Water Parameters:
• pH: 6.7 - 8.2
• Water Hardness: 12 - 18°N (214 - 321 ppm)
• Temperature: 19 - 23°C (66.2 - 73.4°F)
• Tank Setup: Provide a well-planted aquarium with slow-moving water, driftwood, and hiding spaces to mimic their natural habitat.

• Livebearers (e.g., mollies, platies, guppies)
• Tetras
• Corydoras catfish
• Small andpeaceful barbs

Avoid housing them with long-finned or very slow-moving fish to prevent fin-nipping.

Feeding and Diet

Flagfish are omnivorous with a strong preference for algae. A balanced diet includes:

• High-quality vegetable-based flakes or pellets
• Fresh greens such as blanched spinach or zucchini
• Occasional protein sources like bloodworms or brine shrimp

They are excellent algae eaters and will consume hair algae, making them a natural addition to a planted tank.

Sexing

Males display a pattern resembling the American flag, while females have a duller coloration and a rounder body shape.

Breeding

Breeding Flagfish is relatively straightforward:

• The female lays eggs in a small gravel pit she has prepared.
• The male guards the eggs aggressively, even from the female.
• Eggs hatch in about 10 days.
• Fry should be fed infusoria until they are large enough to graze on algae.

Lifespan

With proper care, Flagfish can live up to 8 years.

Common Misidentification

Flagfish have sometimes been mistaken for cichlids due to their parental care behavior, but they belong to the Cyprinodontidae family.

Conclusion

The Flagfish (Jordanella floridae) is a hardy and peaceful fish that excels in controlling algae in planted tanks. Their resilience, colorful appearance, and low-maintenance requirements make them a great choice for both beginner and experienced aquarists.

Picture

Bought by aqua-fish.net from jjphoto.dk.