primary oocyte development and ultrastructure of vitellogenesis in bay scallop, Argopecten irradians concentricus
YUAN Xiu-tang, ZHOU Yi-bing, WANG Li-li
1. National Marine Environmental Monitoring Center, Delian 116023, China 2, School of Life Science and Technology, Dalian Fisheries Univ. , Dalian 116023, China
Abstract: The oocyte development and vitellogenesis were observed in bay scallop, Argopecten irradians concentricus under electronic microscope. Results showed that the oocyte development of the scallop was divided into three stages: previtellogenic, vitellogenic and mature oocytes; five kinds of organelles, i.e. mitochondria, Golgi vesicles, rough endoplasmic reticulum, muhivesicular bodies and mucropinocytotic vesicles were involved in formation of yolk granules, in which mitochondria and Golgi vesicles were the key organelles. Granule materials in oocytes were both endogenous and exogenous and the exogenic nutrients were mainly derived from digestive gland. It appears that the nuclear membrane takes part in formation of multivesicular bodies.