Banded Rainbowfish Breeding Guide
How to breed Melanotaenia trifasciata: conditioning, warm alkaline spawning water, daily egg-laying on mops, 7-12 day hatch and surface fry care.
Overview
Melanotaenia trifasciata is a hardy, highly variable rainbowfish that spawns continuously onto fine-leaved plants or mops, laying batches of adhesive eggs each day over several weeks. Its forgiving requirements make it one of the easier rainbowfish to breed, though raising the tiny surface-feeding fry takes patience.
Sexing
Males are larger and more brightly coloured and develop a much deeper body and longer dorsal and anal fins than females as they mature; some Queensland populations naturally lack the deep body shape. Ready males display constantly to each other, while conditioned females become noticeably plumper with eggs.
Conditioning
Condition the adults in a separate aquarium with plenty of live and frozen foods. Once the fish are in condition, select the fattest, best-coloured pair for the spawning tank.
Breeding Setup
- Spawning tank at least 30 inches (76 cm) long, no substrate needed
- Slightly hard, alkaline water around pH 7.5
- Temperature 80-84°F (27-29°C)
- Small air-powered filter for oxygenation
- Fine-leaved plants such as java moss, or nylon spawning mops
Spawning Behavior & Trigger
A temperature increase often triggers spawning. The pair spawns over a period of several weeks, laying batches of eggs each day, and the eggs attach to plants or mops by a thread.
Egg & Fry Care
Move the eggs to a separate tank filled with water from the spawning tank to protect them from the adults. The eggs hatch in 7-12 days depending on temperature. Newly hatched fry stay near the surface and need infusoria-type first foods, graduating to brine shrimp nauplii after about a week; sinking foods are unsuitable.
Common Challenges
As with other rainbowfish, the main hurdles are removing eggs before the adults eat them and providing fine enough first foods for the surface-dwelling fry during their first week.