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To preserve the skin of an animal requires several preservation steps known collectively as tanning. It involves the curing of the hide in salt, soaking, washing and de-hairing if necessary and the final tanning, usually with Chromium III. This whole process serves the purpose of restructuring the collagen protein particles in the hide, thereby preserving …

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People have been using fish byproducts, such as fish scales and bones, as fertilizer for centuries. Native Americans used to put small fish in tilled soil before planting their seeds; these small fish decomposed slowly, thereby releasing small amounts of nutrients to the plants as they grow. Today, fish waste is usually incorporated in fertilizer; …

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