| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
|
|---|
| Research Abstract |
In crustaceans, ovarian development is under the inhibitory regulation of vitellogenesis-inhibiting hormone (VIH) secreted from a neuroendocrine system in the eyestalks. In this study, its regulatory mechanism was investigated in the kuruma prawn Marsupenaeus japonicus. In immature shrimp, hemolymph VIH levels were constantly low. This result suggests that VIH inhibits ovarian development during the immature stage and that a decline of its levels is a trigger of the initiation of ovarian development. Furthermore, after eyestalk ablation, expression levels of several genes were found to change in the ovaries. This result suggests that various genes are involved in the initiation of ovarian development.
|
