Theme of sean o'faolain's short story "the trout"

Seán O’Faoláin is a chronicler of Irish life and ways, and Ireland has historically been a resource-poor country with a high birth rate. The history of Ireland since the potato famine in the mid-nineteenth century has been marked by periods of massive emigration. During O’Faoláin’s lifetime, much of Ireland’s young, well-educated population left the rural areas for the cities and suburbs, or left the country for England, the Continent, or the United States—wherever they could find greater economic opportunities.

Do you have any idea how to summarize it ? i'm willing to , but not do it for you.