Blythe River Rainbowfish

'Blythe River'

Banded Rainbowfish (Melanotaenia trifasciata) Also known as the Jewel Rainbowfish

A beautiful and variable freshwater rainbowfish native to the small streams, waterholes, and rivers of Northern Territory and Queensland, Australia. Appreciated in the aquarium hobby for its striking banded pattern, colorful fins, and hardy nature.

Key Features

• Maximum Size: 13.0 cm / ~5.1 inches SL (common length around 3.1 inches).
• Appearance: Sleek, fusiform body that becomes deeper in mature males with a humped forehead. Greenish-blue to turquoise upper body transitioning to silvery below, accented by a prominent dark midlateral stripe and vibrant yellow to red fins.
• Fin Details: Dorsal spines 5–7, dorsal soft rays 12–16; anal spines 1, anal soft rays 18–23.

Aquarium Care

• Tank Size: Minimum 55 gallons for a small school (6 or more recommended for best coloration and natural behavior).
• Water Parameters: Tropical freshwater; 72–86°F (22–30°C), pH 6.5–8.0, moderate hardness.
• Diet: Omnivorous — readily accepts high-quality flakes, pellets, frozen, and live foods.
• Behavior: Peaceful, active mid-to-upper water column schooling fish. Excellent for planted community tanks with similarly sized, non-aggressive companions. Provide a tight-fitting lid as they are known to jump.

IUCN Status Least Concern (LC)

Add striking dark bands, colorful fins, and lively schooling action to your aquarium with the beautiful Banded Rainbowfish!