Human: I'd like to know which types of fish are safe to eat. Assistant: 
The most commonly eaten fish include salmon, tuna, cod, pollock, tilapia, and trout. Other popular species include mackerel, sardines, anchovies, herring, and shellfish such as clams, mussels, and oysters. It's important to make sure that any fish you buy has been properly cleaned and is free from parasites or other contaminants.