........Bruh it's the wind....you answered your own question <span />
The fish died, because, using context clues, the word mournfully is usually associated with death or someone/ something leaving, and since a fish couldn't swim away, we would have to believe that the fish has died.
I can tell you the answer if you could list the characters for me to choose from
Answer: Excitement or increased activity
Because, “sensory overload” is the same as when your excited.