The treatment method for Goya fish that is all yellow is as follows:

1. Salt rubbing method: Sprinkle salt on the surface of Goya fish, rub it vigorously, and sprinkle some flour or starch on it. Continue rubbing for 1 to 2 minutes, and finally rinse the fish body with clean water.

2. Hot water method: Use a knife to scrape off part of the mucus on the gar fish and rinse it clean. Slowly pour boiling water of about 80 degrees onto the fish and scrape off the mucus with a knife. After all the mucus is scraped off, Rinse the fish body, then open the fish belly and continue processing the internal organs.

3. Spread flour and salt method: Spread flour and salt evenly on the fish, let it sit for 15 minutes and then rinse with water to clean up the mucus.