2024-03-28T10:08:59Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/751962022-11-17T02:08:08Zhdl_2115_75190hdl_2115_141hdl_2115_21524Quantitative Changes of Major Yolk Protein in the Coelomic Fluid and Gonads of the Sea Urchin, Mesocentrotus nudus, during the Reproductive CycleUra, KazuhiroSuzuki, NatsukiTakei, NarumiHiguchi, IchiroYuhi, TomoharuNishimiya, OsamuTakagi, YasuakiSea urchinMesocentrotus nudusMajor yolk proteinCoelomic fluidGonadReproductive cycle660Both female and male sea urchins accumulate the major yolk protein (MYP) in the nutritive phagocytes of immature gonads before gametogenesis. Additionally, the most abundant protein in the coelomic fluids of both sexes is MYP. In females, MYP in the coelomic fluid is taken up by the nutritive phagocytes and then transported into growing oocytes. In this study, quantitative changes of MYP in the coelomic fluid of both sexes were examined during the reproductive cycle of the wild sea urchin, Mesocentrotus nudus. In females but not males, positive correlation between MYP level and the gonadosomatic index was observed. These results indicate that MYP in the coelomic fluid is suitable as a biomarker of the onset of puberty and progression of maturity in female sea urchins.北海道大学大学院水産科学研究院Departmental Bulletin Paperapplication/pdfhttp://hdl.handle.net/2115/75196info:doi/10.14943/bull.fish.69.1.29https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/75196/1/bull.fish.69.1.29.pdf1346-1842AA11547977北海道大学水産科学研究彙報69129362019-08-07engpublisher