Once upon a time three fish lived in a faraway river. They were named Itsy, Bitsy, and Fitsy. One day they left the wild country where no men lived and came down the river to live near a town.
Fitsy said to the other two: "There is danger all about us here because fishermen come to the river here to catch fish with all sorts of nets and lines, so, let us go back again to the wild country where we used to live."
But the other two fish were so lazy and so greedy that they kept putting off going back to the wild country, letting day after day pass.
Then one day, Itsy and Bitsy swam ahead of Fitsy, but they did not notice a fisherman's net straight ahead of them and accidentally rushed right into it. Fitsy saw what happened and thought, "I must save them!"
Swimming around the net, Fitsy splashed around in the water in front of it, appearing to be a fish that had broken through the net and gone up the river. Then, he swam to the back side of the net and splashed about there, appearing to be a fish that had broken through and gone down the river.
The fisherman saw the splashing water and thought the fish had broken through the net, one escaping up river, the other down. So, he pulled in the net by one corner to check if the fish had indeed escaped, but to his dismay this allowed the two fish to escape from the net, and swim quickly away.
"You saved our lives, Fitsy," they said, "and now we are willing to go back to the wild country."
So back they all went to their old home where they lived safely ever after.

what is the theme of the passage