What is a fungi in the move finding nemo?

In the movie "Finding Nemo," the term "fungi" is used humorously by the character Bruce the shark during a scene where he discusses his fish-friendly support group. Bruce is referring to the idea of "not eating fish," which reflects the movie's theme of friendship and overcoming instincts. However, there are no actual fungi characters in the film; the mention is more of a comedic element.