Arowana needs about three years to climb its back, and their speed of climbing its back is relatively slow. Because they need to reach 30 cm in length before they start to climb their backs, not all scales develop color together, but part of them develop color when climbing their backs.

When their body length reaches 30 cm, the gills will turn golden yellow, and the scales around the gills will also change, but only the scales in 2-4 rows will change. When the body length reaches 35-40 cm, the second scale frame in the front half of the body will change. At this time, their scales have changed greatly, and their hair color is obvious. When they grow to 05 cm, the hair color area will gradually become larger and the scale frame will merge. After the scales on both sides of their bodies are colored, the two rows of scales on their backs will gradually develop color. When all their scales are colored, it means that they have successfully climbed their backs.

1. Stable environment: The scales of Arowana will become more metallic after climbing its back. When breeding, breeders need to ensure the stability of their living environment and avoid being affected by too much environmental fluctuation. It is also necessary to ensure that their living environment is quiet, so as to avoid their dim body color and blackening after being frightened.

2. Sufficient sunshine: After Arowana climbs its back, the breeder should give them regular sunshine, so as to keep their body color bright.