Cutting the stalk of shrimp method is considered a traditional method to stimulate molting process, increase the ability to ripen biology and accelerate the spawning process of shrimp. But, according to scientists, the current production of shrimps by cutting the stalk will reduce the number of reproduction and quality of shrimp.
It is known that the current production of shrimp seed mostly uses the traditional method of cutting mother’s eye stalks to stimulate molting process, increase the ability to ripen the sex and speed up the spawning process of shrimp. The use of this method is because on the stalk of the shrimp (both male and female) containing X organ system (nodal gland), organ X directly controls the synthesis of hormones that inhibit gonad development. (GIH) and molting inhibitory hormone (MIH). Therefore, when cutting the eye stalk will remove the organ X complex, thereby reducing the inhibitor of the development of gonads (GIH).
However, besides the positive side, there is still a negative side: they only leave 3-5 times, then the reproductive life ends, the quality of the following reproductive times decreases. Due to the characteristic of tiger prawns with Thelycum, when cutting the stalks, they will molt, the body reproduces softly so the male shrimp can easily attach seminal vesicles. In contrast, whiteleg shrimp is due to open Thelycum so reproduction is conducted smoothly even without molting.
Based on the above characteristics, the production of vannamei by natural farming has been successful and highly effective. This method is a synchronous series from the selection of broodstock originating from disease-free and investing in the application of integrated technical measures to create white leg shrimp that limit the spread of white spot disease, Taura, yellow head, muscle necrosis, hepatopancreatic necrosis. Therefore shrimp resistance, survival rate and growth rate are also higher than the method of eye cut.