What is bocha fish?

As an AI language model, I don't have any information that distinguishes bocha fish from others. However, I suppose you might mean "bocachico," a freshwater fish found in rivers, lakes and lagoons in South America. These fish are a popular food source and are often consumed by locals. They are generally brown or gray in color, have a cylindrical body shape and can grow up to 50 cm in length. Bocachicos are known for their relatively high fat content and are often used in dishes such as fish soup, ceviche, and fried fish.