What achievements have been made in shellfish breeding in China?

Scientists at home and abroad have done a lot of work in polyploid breeding of shellfish. At present, the technology of crossing tetraploid and diploid of oyster to obtain triploid can be used in industry, and a large number of patents have been applied. Triploid oyster has the characteristics of large size and strong sterility, and has great development potential in breeding and introduction. In addition, polyploid breeding of bay scallop, Chlamys farreri, Chlamys farreri, Chlamys yessoensis, Pinctada martensii, Mytilus edulis, Scapharca subcrenata, Ruditapes philippinarum, Meretrix meretrix, Oncomelania hupensis, Haliotis discus hannai and Haliotis diversicolor has also been studied, but the polyploid research of these shellfish is still in the experimental stage.

In the pure line cultivation of shellfish, various shellfish breeding institutions or laboratories in China have established a large number of families of different shellfish species and cultivated excellent strains with obvious growth and survival advantages or phenotypic characteristics. "Zhongkehong" bay scallop is the first artificially cultivated new shellfish species in China. Breeding by family and hybrid+selection technology shows that family breeding has obvious advantages in cultivating new shellfish varieties with stable genetic traits. In addition, there are Chlamys farreri, Chlamys farreri, Zebra Clam, Sea Red Clam and China Red Wrinkled Haliotis discus hannai, all of which are new varieties or strains cultivated by family breeding methods. "Haiyou 1" Pinctada martensii strain produces mostly silvery white pearls, and its growth cycle is shortened by nearly one year.