Accumulation of Ovarian Ecdysteroids in Synchronization with Gonadal Development in the Giant Freshwater Prawn, Macrobrachium rosenbergii(Endocrinology)
スポンサーリンク
概要
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Changes in ovarian ecdysteroids in association with molting and gonadal developemnt were investigated by high performance liquid chromatography and radioimmunoassay in Macro-brachium rosenbergii. The reproductive molt cycle was synchronized with vitellogenesis, during which gonadosomatic index (GSI) increased from basal values of 0.41 to 8.73 immediately prior to molting. Throughout the common molt cycle, oocytes remained in a previtellogenic state and increases in GSI were not observed. During stages C_O-D_O, ovarian ecdysteroid concentrations were approximately 1-2 ng/g tissue. At premolt stage D_3, concentrations during the reproductive molt cycle (22.9 ng/g) reached values 2-fold greater than those during the common molt cycle (11.4 ng/g). Following reproductive molting, peak ecdysteroid concentrations and high GSI values were maintained until spawning. This indicates that ecdysteroids were accumulated in maturing ovaries in conjunction with the uptake of yolk substances. In contrast, following common molting, ecdysteroid concentrations returned immediately to basal levels of 1.0 ng/g, suggesting that ecdysteroids detected in ovaries during the common molt cycle were due to the presence of circulating hemolymph ecdysteroids. During both molt cycles, major ecdysteroid groups were 20-hydroxyecdysone and immunoreactive high-polarity products, with lesser amounts of ecdysone, inokosterone, and immunoreactive low-polarity products.
- 社団法人日本動物学会の論文
- 1991-10-15
著者
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Aida Katsumi
Department of Aquatic Bioscience, Graduate School of Agricultural and Life Sciences, The University
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Okumura Takuji
National Research Institute of Aquaculture, Fisheries Research Agency
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Wilder M
Japan International Research Center For Agricultural Sciences
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Wilder Marcy
Department Of Fisheries Faculty Of Agriculture The University Of Tokyo
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Wilder Marcy
Japan International Research Center For Agricultural Sciences Ministry Of Agriculture Forestry And F
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Aida Katsumi
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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Okumura T
National Res. Inst. Aquaculture Mie
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Okumura T
National Research Institute Of Aquaculture Fisheries Research Agency
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OKUMURA TAKUJI
Department of Fisheries, Faculty of Agriculture, The University of Tokyo
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AIDA Katumi
Department of Aquatic Bioscience, Graduate School of Agriculture and Agricultural Life Sciences, The
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Okumura Takuji
Department Of Aquatic Bioscience Graduate School Of Agricultural And Life Sciences The University Of
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