A, mussels have pearls
Mussels have pearls, but not all mussels have pearls, and generally difficult to grow pearls in the wild mussels. Pearl formation requires external bugs and sand particles into the mussels, after a long time mussels in order not to be stimulated, secretion of perlage can be wrapped around the bugs and small sand particles for many years to form pearls, natural pearls are generally the best, artificially cultured pearls are very cheap.
Two, how the pearl is formed
1, external causes: the outer coat membrane of the mussel is stimulated by the invasion of foreign objects (sand, parasites), the stimulation of the epidermal cells to the foreign body as the nucleus, the pearl capsule cells secretion of perlage, layer by layer, will be the nucleus wrapped into a pearl, so that the pearl is known as the nucleated pearl.
2, endogenous: mussel outer coat membrane outer epidermis by pathological stimulation, part of the cell division separation, wrapped in their own secretion of organic matter, while plunged into the outer coat membrane connective tissue, the formation of pearl bags to form pearls, known as nucleated pearls.
Three, what kinds of mussels
1, folded crown mussels: folded crown mussels, also known as cockles, lake mussels, mian mussels, etc., mussels, crown mussels belong to the genus of freshwater benthic mussels, common along the coasts of China, generally living in freshwater, slow-flowing and static water lakes, rivers, ditches and pools, or the bottom of the mud and sand.
2, sail mussels: sail mussels, also known as mussels, pearl mussels, freshwater pearl mussels, triangular mussels, etc., widely distributed in Hunan, Hubei, Anhui, Jiangsu, Zhejiang, Jiangxi and other provinces, especially in China's Dongting Lake and medium-sized lakes are more widely distributed.
3, dorsal horn toothless mussels: dorsal horn toothless mussels, also known as vegetable mussels, river mussels, round mussels, etc., distributed throughout China in the rivers, lakes and marshes, the meat can be eaten, but also suitable for fish, bird bait and fodder for poultry and livestock, freshwater pearl mussels.
4, back tumor Li mussels: back tumor Li mussels, also known as hemp skin mussels, hemp crooked, etc., distributed in Hebei, Anhui, Jiangsu, Zhejiang, Jiangxi, Hubei, Hunan, Guangdong and Guangxi, etc., especially the Yangtze River in the middle and lower basins of the large, medium-sized lakes and rivers within the high yield.
5, dome pearl mussel: dome pearl mussel shell medium size, thin and hard shell, long oval shape, length greater than 2 times the height, shell asymmetry on both sides, shell front short round, after not elongated, end slightly narrow, shell surface dark brown or black.