Does bone meal mean that fish bones are pulverized?

Bone meal refers to powdered fertilizer made from animal bones. The main components of animal bones are tricalcium phosphate, bone glue and fat. Generally, bone meal can be divided into boiled bone meal, coarse bone meal (raw bone meal) and steamed bone meal (degummed and defatted bone meal) according to the production method. The decocting method is to put the broken bones into a pot, add water to boil, and add appropriate amount of quicklime and plant ash. You can add it when cooking, remove fat and colloid while cooking until the bone is basically oil-free, and then dry and crush it. Coarse bone powder is prepared by pulverizing animal bones, boiling, removing part of oil and bone glue, and drying and pulverizing; Degummed or defatted bone powder is made by putting animal bones into a high-pressure tank and removing most of the oil and bone glue through high temperature, high pressure and steam. Bone meal is generally grayish white powder, which is insoluble in water. The phosphorus contained in it is difficult to be used by plants, but it can be used quickly in acidic soil. Can be mixed with compost or manure and fermented to be used as base fertilizer. It can also be used as animal feed.