Clams are hermaphroditic and generally mature for two years. The gonads of sexually mature clams are distributed around the visceral mass and extend to the base of the foot. The female gonad is milky white, and the male gonad is light orange (or milky yellow). The egg is spherical, about 70-90 microns in diameter, and there is a colloidal egg membrane outside the egg. Sperm is a narrow cocoon, about 3 microns long. Its meat is very delicious, known as "the freshest in the world" and "the highest in all tastes", and its nutrition is also very comprehensive. It contains protein, fat, carbohydrate, iron, calcium, phosphorus, iodine, vitamins, amino acids and taurine. Low in heat energy, high in protein and low in fat, and can prevent and treat chronic diseases in middle-aged and elderly people. This is a cheap seafood. The oldest clam found so far is 507 years old (unfortunately, the researchers killed it during the research). In addition, clams are also known as one of the five immortal beasts on earth. ?

The breeding season of Meretrix meretrix is in early summer, which varies with species and regions. The spawning period in Liaoning and Shandong is from July to August, in Jiangsu, Zhejiang and Fujian from June to July, and in Guangdong and Guangxi from May to July. The surface temperature of seawater during the spawning period of Meretrix meretrix is about 27-29℃.

The suitable water temperature for the embryonic development of Meretrix meretrix is 24.9-3 1.4℃, preferably 26-28℃, and the suitable seawater ratio is1.01.025,1.0/kloc-0. The bait is fresh and rich, with good quality, large larvae and early metamorphosis, mainly because of the large biomass of bait in the culture pond. In early spring, fresh fish and shrimp slurry is sprinkled all over the pond to increase the amount of organic impurities in the pond; Use compound fertilizer and organic fertilizer to fertilize water in sunny days in summer and autumn; In late autumn and early winter, soybean milk is used for splashing feeding in the whole pool. .

The substrate suitable for survival of Meretrix meretrix seedlings should be above 75% (total sand is the best); The seedlings have strong adaptability to low specific gravity seawater, and can still survive and grow when the specific gravity of seawater drops to 1.003- 1.005 in a short time. The growth rate of seedlings in natural sea area is faster than that of artificial seedlings. Every other month, the water body is disinfected and prevented from diseases with drugs such as quicklime (10kg/ mu) or chlorine dioxide (0. 125kg/ mu). ?