The theme of transformation is also a possibility. The night can often be associated with change. The fish in the story might undergo some sort of transformation, either physical or metaphorical. This could be related to growth, evolution, or even a spiritual change. It could also be a way to show how the environment, like the night - time water world, can influence the fish's existence.
One possible theme could be the mystery of the night. Since it's a 'fish night' story, the night might add an element of secrecy and the unknown. Another theme could be the relationship between humans and fish, especially if there are humans involved in the story.
One possible theme could be fear. The night often represents the unknown, and in a short story set at night, fear of the dark, of what lurks in the shadows could be a major theme. Another could be isolation. At night, a character might feel more alone, cut off from the rest of the world.
One possible theme could be change. Since night and day are two very different states, the story might explore how things or people change from one state to another.
One possible theme could be food and celebration. Lobsters are often associated with special occasions and a sumptuous meal. So the story might revolve around the joy and togetherness that comes with a lobster - centered event.
One possible theme could be mystery. The full moon often creates an air of mystery, and the story might revolve around something unknown that occurs on that night.
One possible theme could be transformation. The girl's change from a human to a fish is a major transformation that can represent change in general in life.
One possible moral could be the importance of unity. Just like the three fish in the story might need to work together to face difficulties, such as when dealing with predators or changes in their environment.
It could be about a unique and perhaps surreal experience related to fish at night. Maybe it involves some kind of transformation or mystery that occurs when the night falls and fish are involved. For example, it could be about a fisherman who witnesses something extraordinary while fishing at night.
Perhaps the theme of self - discovery is in the story. The bravest fish may embark on a journey where it discovers its own strength and capabilities. Also, the theme of friendship could be there. Maybe the fish is brave in order to protect its friends or make new ones in a challenging environment. And there could be a theme of perseverance, as the fish doesn't give up in the face of difficulties.
The theme of self - discovery could be present. For example, a woman who takes night walks to think and figure out her life path. Also, a theme of resilience. A night woman facing difficulties at night, like a single mother working at night to support her family, and still being strong.
One possible theme could be transformation. The girl's change from a human to a fish is a significant transformation that can represent many things like growth or a new phase in life.