On a certain clandestine gardening message board I used to frequent, some of the "growers" took issue with fish-based fertilizers. And if I'm not mistaken, Alaska Fish Fertilizer was the one specifically mentioned. I'm only going by memory, but I believe that the way in which the fish are processed calls into question whether the product is organic. Also, some fish fertilizers are made from fish whose populations are growing scarce.
I have never used fish emulsion, but if I were to do so I would want to be assured that the product is made from fish scraps and waste. In other words I would want to know that the ocean wasn't being depleted of fish for the sole purpose of manufacturing fertilizer. And I would want to know that phosphic acid wasn't used in the manufacture of the product.
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