I always thought that fish fertilizer was an acceptable product. As a nitrogen source, it is very overpriced, as explained in Fish Fertilizer—Is It Worth Buying? But at least the fertilizer is being made from a resource that is a waste product, namely, fish guts (offal), bones, and heads. It seemed like a good use for this waste product.
But a comment left on my other post by Cynthia E. Olen, June 12, 2016, made me rethink things. Thank you, Cynthia.
Did you know that companies are harvesting whole fish to make the fertilizer? I didn’t believe it myself, but it is true.
