How d you know if your frozen salmon filet is gone bad?

To determine if your frozen salmon filet has gone bad, check for any off-putting odors, discoloration, or changes in texture, such as a slimy surface. If the fish appears freezer-burned, with dry spots or a grayish hue, it's best to discard it. Additionally, if the salmon has been stored for an extended period beyond its recommended freezer life (typically 3-6 months), it's safer to err on the side of caution. Always trust your senses and when in doubt, throw it out.