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It will be interesting to see what you find out. Feed degrades over time, vitamins lose potency, etc. Normal shelf life is 12 months, but I've fed feed that was 2-3 years old. The fish didn't seem to know the difference, but since I am not a production facility, I don't typically keep tabs on FCR, etc.
A supplier that raises trout said they had to switch suppliers 2 years ago. Same feed supplier, supposedly same food but their FCR's dropped roughly 15% and the price of the food actually went up $1/bag. It was a big enough change that they had to cancel a few fish contracts.
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