Fish scraps

Heads, bones, skins and viscera left over from fish processing or retail.

Characteristics

Raw material for fish emulsions and hydrolysates used as organic fertilizers.
Supply nitrogen, phosphorus, potassium and micronutrients from the whole fish.
Commercial emulsions typically analyse around 4-1-1 to 5-2-2 NPK.
Cited in traditional fermented preparations together with a sugar source.

Role in the preparation: It supplies nitrogen and other nutrients to the preparation after being fermented or hydrolysed and strained.

Caution: Strong odours attract animals: work in a closed container, wear gloves, stay away from homes and watercourses, and follow local rules on animal by-products.

Sources: Fish emulsion - Wikipedia · Fish Emulsion - Chicago Botanic Garden

Documentary information: this is neither a recommendation for use nor a plant-protection or veterinary claim. Check your country's regulations before any use.