Who is the fish that's separated from its father?

The fish that is often depicted as being separated from its father is Marlin's son, Nemo, from the animated film "Finding Nemo." In the story, Marlin, a clownfish, embarks on a journey across the ocean to find his son Nemo after he is captured by a diver. Their adventure highlights themes of parental love, courage, and the importance of family.