The Threadfin Rainbowfish (Iriatherina werneri) is a small and enchanting freshwater fish species prized for its delicate and elegant appearance. These rainbowfish have an elongated body with extremely fine, thread-like rays extending from their dorsal fin, which give them their name.
They are typically quite small, reaching lengths of about 2 to 2.5 inches. Threadfin Rainbowfish are known for their captivating iridescent colors, which can include shades of blue, green, and yellow. They often display a distinctive orange or yellow stripe along their body, which adds to their beauty.
These fish are peaceful and best kept in groups in a well-planted aquarium with clean, well-maintained water. They thrive in slightly alkaline water conditions and should be provided with a varied diet that includes high-quality flakes, live or frozen foods, and small invertebrates. Due to their small size, they are suitable for nano aquariums and are a popular choice among aquarists for their unique appearance.