Reveal the white spots in the fish meal

There are some small white flakes in the fishmeal. Sometimes I see very small in the sample. Sometimes I can see a little larger 2-8mm. When I look at the mirror, I can’t see these white spots without paying attention. In the big sample, I think it is a big fish bone or a fish tooth. The main components of fish bones and fish teeth are hydroxyapatite, with a calcium content of about 40% and a phosphorus content of about 19%. The substance selected by the selection has the following characteristics: the addition of hydrochloric acid bubbles, the calcium content is 39.5%, and the phosphorus content is negligible.

The surface is smooth and there are no signs of smashing. Some small white spots are made up of smaller stones, which are not transparent, neither minerals nor bones. Yesterday evening, it may be the brain stone of the yellow croaker. Today, the supplier finds some yellow croakers and knocks on their heads. It is really a brain stone. Each fish has two such stones. The big fish stone is bigger. The small fish stone is smaller and has the same properties as the stone found in the fish meal. When you see this stone, you can tell that the fishmeal is made up of some yellow croaker or other similar fish. The more the fish, the more the stone.