Why did your cod fish have a bitter taste?

Cod fish can develop a bitter taste due to several factors, including the fish's diet, handling, and storage conditions. If the fish consumed certain types of algae or other marine organisms, it could impart a bitter flavor. Additionally, improper handling, such as delays in gutting or storing at incorrect temperatures, can lead to the breakdown of proteins and fats, contributing to bitterness. Lastly, the age of the fish prior to consumption can also affect its taste profile.