I'm not sure which specific 'fish friends three' story you mean. There could be many stories about three fish friends. Maybe they live in a pond and have adventures together, like finding a new hiding place from a big fish.
I'm not sure specifically which 'fish friends story' you mean. There could be many stories about fish friends. It might be about a group of fish in a pond who become friends and help each other find food or avoid predators.
The three little fish story might imply the value of exploration. Suppose the fish are not all the same type or have different personalities. One might be more adventurous and lead the others to new places in their watery world. By exploring together, they could find better hiding places, more food sources, or even make new friends among other sea creatures. This would suggest that being open to exploration can bring benefits when you have companions to support you.