What does the servant do when he encounters some fish one day while on his travels?

Questions below are based on the following passage.     The following excerpt is from “The White Snake” by Jacob Grimm and Wilhelm Grimm.     A long time ago there lived a king who was famed for his wisdom through all the land. Nothing was hidden from him, and it seemed as if news of the most secret things was brought to him through the air. But he had a strange custom; every day after dinner, when the table was cleared, and no one else was present, a trusty servant had to bring him one more dish. It was covered, however, and even the servant did not know what was in it, neither did anyone... Show more

Questions below are based on the following passage.    
The following excerpt is from “The White Snake” by Jacob Grimm and Wilhelm Grimm.    

A long time ago there lived a king who was famed for his wisdom through all the land. Nothing was hidden from him, and it seemed as if news of the most secret things was brought to him through the air. But he had a strange custom; every day after dinner, when the table was cleared, and no one else was present, a trusty servant had to bring him one more dish. It was covered, however, and even the servant did not know what was in it, neither did anyone know, for the king never took off the cover to eat of it until he was quite alone.    
This had gone on for a long time, when one day the servant, who took away the dish, was overcome with such curiosity that he could not help carrying the dish into his room. When he had carefully locked the door, he lifted up the cover, and saw a white snake lying on the dish. But when he saw it he could not deny himself the pleasure of tasting it, so he cut of a little bit and put it into his mouth. No sooner had it touched his tongue than he heard a strange whispering of little voices outside his window. He went and listened, and then noticed that it was the sparrows who were chattering together, and telling one another of all kinds of things which they had seen in the fields and woods. Eating the snake had given him power of understanding the language of animals.    
Now it so happened that on this very day the queen lost her most beautiful ring, and suspicion of having stolen it fell upon this trusty servant, who was allowed to go everywhere. The king ordered the man to be brought before him, and threatened with angry words that unless he could before the morrow point out the thief, he himself should be looked upon as guilty and executed. In vain he declared his innocence; he was dismissed with no better answer.    
In his trouble and fear he went down into the courtyard and took thought how to help himself out of his trouble. Now some ducks were sitting together quietly by a brook and taking their rest; and, whilst they were making their feathers smooth with their bills, they were having a confidential conversation together. The servant stood by and listened. They were telling one another of all the places where they had been waddling about all the morning, and what good food they had found; and one said in a pitiful tone: ‘Something lies heavy on my stomach; as I was eating in haste I swallowed a ring which lay under the queen’s window.’ The servant at once seized her by the neck, carried her to the kitchen, and said to the cook: ‘Here is a fine duck; pray, kill her.’ ‘Yes,’ said the cook, and weighed her in his hand; ‘she has spared no trouble to fatten herself, and has been waiting to be roasted long enough.’ So he cut off her head, and as she was being dressed for the spit, the queen’s ring was found inside her.    
The servant could now easily prove his innocence; and the king, to make amends for the wrong, allowed him to ask a favour, and promised him the best place in the court that he could wish for. The servant refused everything, and only asked for a horse and some money for travelling, as he had a mind to see the world and go about a little. When his request was granted he set out on his way, and one day came to a pond, where he saw three fishes caught in the reeds and gasping for water. Now, though it is said that fishes are dumb, he heard them lamenting that they must perish so miserably, and, as he had a kind heart, he got off his horse and put the three prisoners back into the water. They leapt with delight, put out their heads, and cried to him: ‘We will remember you and repay you for saving us!’    
He rode on, and after a while it seemed to him that he heard a voice in the sand at his feet. He listened, and heard an ant-king complain: ‘Why cannot folks, with their clumsy beasts, keep off our bodies? That stupid horse, with his heavy hoofs, has been treading down my people without mercy!’ So he turned on to a side path and the ant-king cried out to him: ‘We will remember you—one good turn deserves another!’    

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