Final answer:
The provided excerpts contain no reference to Agatha or a wish fish. They focus on literary themes like imagination, the natural world, and supernatural folklore.
Step-by-step explanation:
In the stories provided, there is no instance where Agatha tries to call the wish fish, which seems to be a misunderstanding of the text. Instead, these excerpts are from various literature pieces and do not explicitly discuss a character named Agatha or a wish fish. However, exploring the information given, we can analyze literary devices and themes such as imagination, the natural world, and supernatural elements present in folklore.