Bernice Brewster

Basically, any factor that affects Koi in such a way as to extend or disturb the ‘normal’ resting condition. This definition includes just about everything, from water conditions, to netting and handling Koi, to predators. We tend to think of stress as very negative, but of course this response is a normal reaction. It is only when we prolong exposure to the stressful event that secondary disease problems can arise.