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An indoor trial was conducted for 42 days to evaluate water quality, Vibrio density and growth of Litopenaeus vannamei in an integrated biofloc system ( IBS) with Gracilaria birdiae. Four treatments were used, each in triplicate: Control (monoculture shrimp); IBS 2.5 ( L. vannamei and 2.5 kg wet weight seaweed m−3); IBS 5.0 ( L. vannamei and 5.0 kg wet weight seaweed m−3) and IBS 7.5 ( L. vannamei and 7.5 wet weight seaweed m−3). Shrimp individuals (0.34 ± 0.01 g) were stocked at a density of 500 shrimp m−3. No water exchange was carried out during the experimental period. Molasses was added once a day as an organic carbon source to maintain the C:N ratio at 12:1. The IBS significantly decreased ( P < 0.05) dissolved inorganic nitrogen ( DIN) ranging from 19% to 34% (3.12-3.83 mg L−1), NO3- N ranging from 19% to 38% (2.40-3.16 mg L−1), Vibrio density ranging from by 8-83% (0.40-2.20 log 103 colony-forming units mL−1), and FCR ranging from by 20-30% (1.20-1.37), as compared to the control (4.73 mg L−1, 3.93 mg L−1, 2.40 log 103 colony-forming units mL−1, and 1.74 respectively). Moreover, the IBS significantly increased ( P < 0.05) crude protein in whole body shrimp, ranging from 8% to 13% (13.2-13.7% wet weight basis); as well as final weight, ranging from 25% to 32% (3.90-4.12 g), weekly growth ranging from 25% to 34% (0.59-0.63 g), and shrimp yield by 22-39% (1.72-1.96 kg m−3), as compared to control (12.1% wet weight basis, 3.12 g, 0.47 g, and 1.41 kg m−3 respectively). It can thus be concluded that cultivating Gracilaria birdiae in an IBS with L. vannamei can contribute to DIN and NO3- N removal, lower Vibrio density, increased crude protein in whole body shrimp, higher growth and yield parameters in shrimp culture. [ABSTRACT FROM AUTHOR]

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Copyright of Acta Scientiarum: Biological Sciences is the property of Universidade Estadual de Maringa and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)