Koi has a rather bent appearance (minor or major)

Disease/Analysis:- 

• Electrical discharge in the pond through nicked wire or lightning strike
• Scoliosis (ascorbic acid deficiency

Testing Tool(s):-

• Visual Test

Treatment 1:-

• There is no cure to bent fish. However, the fish can still live for a long period of time in this condition.

Treatment 2:-

• If Scoliosis then having a food with higher content of Vitamin C