Fish do not develop feelings for their owners. Through training, the fish will form certain conditioned reflexes and interact with its owner, but its brain structure is simple and it is unlikely to have complicated situations. They may swallow the fish eggs they produce, let alone have an emotional connection with their owners. What makes them active and excited is every time their owners feed them.

Solutions to fish being afraid of people:

1. Spend more time with them. Always spend time with them, watch them, and appear next to the fish tank frequently, and they will become familiar with you.

2. Avoid being frightened. Don't make loud noises near the fish tank. When walking past the fish tank, move slowly and don't make large movements. Once the fish is frightened, it will become afraid of people in the future.

3. Feed regularly. You should often feed the fish with your hands to let them get used to the presence of people. When they see people, they will know that there is food and they will take the initiative to swim over.

4. Feed when you are hungry. Starve them for a few days, then slowly walk to the fish tank and feed them with food. You will slowly be able to train the koi to eat from your hands.

5. Old fish bring in new fish. You can adopt the method of bringing old fish with new fish to promote the new fish to start eating quickly.