Misery loves company. Sergei is trapped in his world of fear and it is human nature to fear being alone. He is dragging the fish down with him. Sergei has found his prime companion, someone who cannot leave, and for someone who fears relationships immensely having a “friend” in whom he is in control gives him security because he is so alone the fish is all he has. He is so afraid of being a lone that he convinces himself that someone is out to get his goldfish and kills him for it.
In the last paragraph it reads “The one that looked straight into the camera and said, if he ever found a talking goldfish he wouldn’t ask of it a single thing. He’d just stick it on a shelf in a big glass jar and talk to him all day, it didn’t matter about what. Maybe sports, maybe politics, whatever a goldfish was interested in chatting about.
Anything, the Russian said, not to be alone.” This is the main example of his loneliness. He could have anything he could ever want, he has the key to change the world, and all he would do was use him as a friend. A friend that couldn’t leave. this shows that Sergei, despite his efforts does not wish to be