Why Are My New Koi Hiding During the Day?

A pond owner installed a 1,000-gallon pond with three waterfalls and added four koi three weeks ago. The fish explored initially, then retreated to a hiding spot. They only emerge at night under LED lights, staying hidden all day. Water is cool, with late afternoon sun. The owner considers adding goldfish or a "trained" koi to coax them out.

Understanding Koi Shyness

New koi are naturally timid for weeks. Their nighttime activity is instinctual—darkness signals fewer predators. Daytime hiding is a survival behavior, not a training issue.

How to Encourage Confidence

1. Stop feeding for several days. Hunger overrides caution.
2. Feed only when standing perfectly still at the pond's edge. Repeat daily until they associate your presence with food.
3. Gradually introduce hand-feeding. Keep your hand submerged and motionless.
4. Minimize activity around the pond. Foot traffic and movement prolong hiding.

Why Not Add Goldfish?

Goldfish can increase koi stress through competition and different behavior patterns. Patience and consistent, calm interaction work best.

Bottom line: Wait for warmer water, maintain a quiet environment, and use targeted feeding to build trust. The fish will emerge naturally as they acclimate.