Fotonilla

Fotonilla is a genus of small, colorful fish belonging to the family Cyprinidae, commonly known as carps and minnows. Native to Southeast Asia, particularly freshwater habitats in countries such as Thailand, Malaysia, and Indonesia, Fotonilla species are popular in the aquarium trade due to their vibrant appearance and active behaviors.

These fish typically grow to a size of about 2 to 4 centimeters (0.8 to 1.6 inches) in length. They are characterized by their slender bodies, bright coloration—which may include shades of red, blue, or yellow—and distinctive fin patterns. Fotonilla species are generally peaceful and social, thriving in groups in well-maintained aquariums with clean, oxygen-rich water.

Fotonilla prefers environments that mimic their natural habitats, which are often slow-moving or still freshwater bodies with plenty of aquatic plants and hiding spots. They are omnivorous, feeding on flake foods, live or frozen invertebrates, and plant material within their ecosystem.

As a genus, Fotonilla is of interest to both amateur aquarists and ichthyologists. Their small size and adaptability make them suitable for community tanks, although appropriate tank mates should be chosen carefully to prevent stress or aggression. Breeding these fish in captivity is possible, with males and females exhibiting subtle differences in coloration during reproductive periods.

Overall, Fotonilla species are valued for their vivid colors and lively behavior, contributing to the biodiversity and aesthetic appeal of freshwater aquarium setups. Their presence in scientific research is limited but can provide insights into the ecology and evolution of small freshwater fishes in Southeast Asia.