Elucidation of molting and reproductive mechanisms in the giant freshwater prawn, Macrobrachium rosenbergii
Country
Asia
Description
[Synopsis]
The giant freshwater prawn, Macrobrachium rosenbergii, is a commercially important crustacean species cultured extensively throughot Southeast Asia. In order to promote a more stable, efficient form of aquaculture, the development of improved technology for the production of seed (larvae) is highly necessitated. Artificial production techniques are based on the ability to induce reproduction and spawning in captivity, but knowledge concerning the basic mechanisms of these physiological processes is insufficient. In this research, the involvement of various endocrinological factors in the control of molting and reproduction were investigated in M. rosenbergii. Ecdysteroids which control molting, were additionally found to accumulate in maturing ovaries and to be present in newly-laid eggs, indicating a potential role in ovarian development and embryogenesis in this species. In addition, juvenile hormone (JH)-related substances were investigated, revealing the presence of the JH precursor, methyl farnesoate (MF) in the hemolymph. (MF) was seen to fluctuate during the molting cycle, suggesting that this hormone has a role in molting in addition to reproduction. This research also examined the synthesis of yolk protein, vitellogenin and its hormonal control. These results will form a basis for the promotion of cooperative research between JIRCAS and Cantho University, College of Agriculture, Vietnam within the framework of a cooperative project on combined farming systems in the Mekong Delta.
- Affiliation
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Japan International Research Center for Agricultural Sciences Fisheries Division
- Classification
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Technical A
- Term of research
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FY1995-1998
- Responsible researcher
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WILDER Marcy Nicole ( Fisheries Division )
TUAN Nguyen Anh ( Can Tho University )
PHUONG Nguyen Thanh ( Can Tho University )
OANH Dang Thi Hoang ( Can Tho University )
PHU Truong Quoc ( Can Tho University )
- ほか
- Japanese PDF
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1996_13_A3_ja.pdf802.61 KB