[COM]

Most "people food" is treated so as to not become toxic if it thaws and reheats. I'm in the CPG business... I read the trade rags... depending on exactly what you do you may not need to display a radura <no clue on spelling> on your package. I would think that based on the supply chain networks that serve pet stores, most frozen fish foods are probably passed through a rudimentary irradiation process because they are likely to thaw and refreeze at least once in the distribution channel before you buy it. Probably still a good idea to ditch the old food; it could have become tainted in any number of ways.