ABSTRACT
A 50 days nursery trial was conducted in Penaeus vannamei, stocked at 6000PLm−3 in 50 m3 raceways and 2300PL m−3 in 100 m3 lined ponds in duplicates. Microbial Floc-Carbohydrate Enriched Distillery Effluent (MF-CEED), obtained as distillery spentwash from the distilleries was used as the carbon source to maintain a C:N ratio at 15:1. Nitrate-N was significantly greater in the outdoor lined ponds, accumulating to a peak mean concentration of 216 mg NO3-N L−1 whereas it was below 24 mg NO3-N L−1 in the Indoor raceways. The raceways showed significantly higher 5-Day Biochemical oxygen demand (BOD5) and Total suspended solids concentration compared to lined ponds due to increased bacterial biomass. The Protein Efficiency Ratio/survival and yield were significantly higher in indoor raceways. These results indicate that differences in the culture environment on the application of MF-CEED can lead to substantial disparity in system function and shrimp production. Thus, the nursery phase of Penaeus vannamei at higher stocking density in Indoor raceways systems ensures the predominant growth of heterotrophic bacteria with effective water quality than compared to the outdoor line ponds in the Aerobic Microbial Floc (AMF) technology.
