The giant freshwater prawn, Macrobrachium rosenbergii is commercially cultured in Asian countries. Males grow faster than females and can be harvested in a larger size. Therefore, there is a high market demand for male prawn both in Thailand and for export. Because growth is a major concern for freshwater prawn culture, mono-sex culture is an alternative way to achieve higher average body weight at harvest and thus higher yields. In addition, the number of wild giant freshwater prawn has continued to decline, so the development of a new strategy that can produce male freshwater prawn for mono-sex culture will be of great benefit to prawn industry of the country in terms of both prawn production and export.
TECHNOLOGY FEATURES & SPECIFICATIONS
A sex reversal technology through temporal gene silencing could cause complete sex reversal of male prawn into a functional female (neo-female) that is capable of mating with normal males and producing male progeny with larger size and higher market value than females. This technology will be the best choice to prawn industry of the country in terms of both prawn production and export.
The process of neo-female production comprises the use of double-stranded RNA compounds to silence the expression of sexual-differntiation gene causing sex-reversal of males into function neo-females. The neofemales were crossbred with normal males to produce male progeny. The monosex male culture exhibits higher yields, higher average body weight at harvest and higher survival rates than either mixed-sex or monosex female cultures under non-intensive conditions.
- Produce neo-female freshwater prawn and reduce the cost of male freshwater prawn production.
- Increase male freshwater prawn that higher yields, higher average body weight at harvest.
- Enhance the competitiveness of Thai shrimp in global shrimp industry.