1. Reason: The scales of Arowana may be caused by trauma. In the daily feeding process, they will collide and be injured because of fighting, competing for food, being frightened and bumping into cylinders, etc.

2. Solution: Breeders need to breed Arowana alone to avoid them fighting again. Then give them a medicated bath with oxytetracycline to avoid infection in the wound. It is also necessary to ensure that their living environment is quiet and prevent them from being frightened.

1. Reason: The scales of Arowana may also fall because of irregular water change. For example, the breeder changes too much water for them or the way of changing water is not equal, which will cause them to fall scales.

2. Solution: Breeders need to change water according to the water quality they live in. Under normal circumstances, they can change water once a week. When changing water, pay attention to the temperature difference between new water and old water not exceeding 1 ℃. When injecting new water, the breeder should slowly add it along the cylinder wall to avoid the water impacting the fish.

1. Reason: Scaling of Arowana may also be caused by illness, such as common parasitic infection, water mold and white spot disease.

2. Solution: Breeders should first judge their etiology, then keep the environment stable, and finally choose appropriate drugs according to the etiology.