Development
Fertile Harlequin Rasbora eggs require approximately 18 hours to hatch at a temperature of 28°C. Upon hatching, the fry are translucent, around 3 to 4 millimetres long, and remain attached to the leaf upon which the eggs were laid for a further 12 to 24 hours, during which the yolk sac is absorbed. Once this process is completed, the fishes become free-swimming, and at this stage, require very fine sizes of food such as live infusoria for a period of 7 to 14 days, after which the fry are able to feed upon newly hatched Brine Shrimp. If infusoria are unavailable, commercial prepared foods for egglayer fry may also be used.
The Harlequin Rasbora takes approximately 8 to 10 weeks for the fry to assume full adult colouration.
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