What does "the fish swam to my heart first" mean and what does it mean?

It means that fish painted by young people are lifelike, just like swimming on paper.

It shows that young people observe fish and are very familiar with goldfish, so they can draw them vividly.

In Fish Swim to Paper, the fish swam to your paper, which means that the young people's painting skills are very good and realistic. The relationship with the youth at the end of the article that "the fish swam to my heart first" is causal. Only by carefully observing the shape, movement and dynamics of the fish and printing it in your mind can you draw the charm of the fish and make it lifelike. To sum up with an idiom is to have a plan.