Study On The Desalting Form And Aquaculture Technology Of Penaeus Vannamei

This study on desalting and culture technology of Penaeus vannamei was carried out by various mothods, and tried to develop technical innovation, in order to improve the survival rate of P. vannamei and increase economical benefits. Two-desalting technology of P. vannamei larvae and three-desalting technology of P. vannamei earlier larvae were developed and consummated by these researches, which study the impact of the prawn's survival rate by dealing with desalting rate, natural and artificial seawater separately in this paper. The prawn's second-crop technology based on second-crop investigation for water quality, body increase rate of the prawn and relation between bait casting in culture and body increasing of the prawn were summarized. The culture economic benefits of P. vannamei using three-desalting second-crop technology was analysed. In addition, this research also modified the design of ponds and water quality for the exploration of non-pollution treatment. The results showed that three-desalting second-crop technology was able to improve the economic benefits of P. vannamei culture remarkably. Moreover, the content of two-desalting, three-desalting and three-desalting second-crop technological manipulation was summarized by the experiment and the productive practice. In the end, this paper indicated that the scientific culture, ecological farming and pollution-free farming of Penaeus vannamei will be inevitable and feasible entirely in future. The results show that the survival rate of Penaeus vannamei is more than 93% to the size of about 0.5-0.8cm, the best time interval is 72 h, as water desalination proportion of 1.012 to 1.000. the average seedling survival rate of 77.44% to two-desalting technology of P. vannamei, the survival rate of 87.00% to three-desalting technology of P. vannamei, and control nitrite and ammonia nitrogen concentration better; the difference of growth rate is not significant among second-crop Penaeus vannameis, After about 70d the second crop have been able to meet market standards, then body length is more than 10cm; compared with the second crop culture, the ammonia content in water of single crop culture have a slight decrease, while the nitrogen content is relatively low, but there are no significant differences (p>0.5). In this study, the profits of second crop farming of Penaeus vannamei can reach more than 4,000 yuan per 667m2, compared with single-crop farming(more than 2920 yuan per 667m2), the economic profitability has been greatly increased. Therefore, it is worthwhile to promote the three-desalting second crop farming technology .