Findings on the Practical Models of Whiteleg Shrimp Farming Using Indigenous Microorganisms in Quang Tri Province, Vietnam

This study evaluated the effectiveness of indigenous microorganisms in a two-phase whiteleg shrimp farming system in Quang Tri province. Four bacterial strains and two algal species were integrated into the shrimp pond. The first phase culture with a 21-day nursery in cement tanks (1000 PL12/m³), survival rate, growth rate, and feed conversion ratio (FCR) averaged 99%, 0.04 g/shrimp/day, and 0.99, respectively. The second phase culture investigated two models: a linning pond (LP) (150 shrimp/m², biofloc technology), a Earthen pond with lined around the banks (ELPB) (70 shrimp/m², semi-biofloc technology), and control ponds without indigenous microorganism supplied. Compared to controls, LP exhibited 96% survival (vs. 80%), 0.24 g/shrimp/day growth (vs. 0.22 g/shrimp/day), and an FCR of 1.29 (vs. 1.5). Whereas ELPB showed survival of 95.5% (vs. 89%), growth rates of 0.25 g/shrimp/day (vs. 0.23 g/shrimp/day), and an FCR of 1.26 (vs. 1.30). Linning ponds demonstrated double the yield of ELPB. Importantly, the system avoided water exchange, not use antibiotics, maintaining optimal water quality and disease prevention throughout both cropping cycles. This result support the development and nationwide implementation of indigenous microbial products and biofloc technology for sustainable whiteleg shrimp farming.