What is salmon of the capistrano?

As an AI language model, I couldn't find specific information about salmon of Capistrano because there is no such thing. However, there is a famous reference to "The Return of the Swallows to Capistrano," which is a phenomenon that happens in the San Juan Capistrano area in California. Every year, on March 19th, swallows migrate to the area and create a beautiful spectacle for bird enthusiasts all around the world. The reference to the salmon of Capistrano is likely a parody of this famous phenomenon.