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- Title
Water quality, Vibrio density and growth of Pacific white shrimp Litopenaeus vannamei ( Boone) in an integrated biofloc system with red seaweed Gracilaria birdiae ( Greville).
- Authors
Brito, Luis Otavio; Chagas, Augusto Monteiro; Silva, Elizabeth Pereira; Soares, Roberta Borda; Severi, William; Gálvez, Alfredo Olivera
- Abstract
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.
- Subjects
WHITELEG shrimp; GRACILARIA; WATER quality; CRUSTACEAN growth; BIOREMEDIATION
- Publication
Aquaculture Research, 2016, Vol 47, Issue 3, p940
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1111/are.12552