Comparing a chemoautotrophic-based biofloc system and three heterotrophic-based systems receiving different carbohydrate sources |
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| Affiliation: | 1. Key Laboratory of Aquaculture Health and Safety, College of Life Science, South China Normal University, Guangzhou 510631, PR China;2. Department of Environmental Science and Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, PR China;1. Universidad de Sonora. Departamento de Investigaciones Científicas y Tecnológicas de la Universidad de Sonora. Blvd. Luis Donaldo Colosio, S/N., Hermosillo, Sonora, Mexico;2. Centro de Investigación en Alimentación y Desarrollo, A.C. Km 0.6 Carretera a La Victoria, Hermosillo, Sonora, Mexico;3. Centro de Investigaciones Biológicas del Noroeste. Carretera a Las Tinajas, predio El Tular, Colonia las Tinajas. Guaymas, Sonora, Mexico;4. Centro de Investigación Científica y de Educación Superior de Ensenada. Carretera Ensenada-, Tijuana, No. 3918, Zona Playitas. Ensenada, B.C., Mexico |
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| Abstract: | A 56-day study was conducted in which shrimp (Litopenaeus vannamei) were stocked at 300 m−3 into 16, 500-L tanks. Four treatments were created: chemoautotrophic (CA), heterotrophic sucrose (HS), heterotrophic molasses (HM), and heterotrophic glycerol (HG). The heterotrophic treatments were managed such that the C:N ratio of inputs (feed and carbohydrate source) was 22:1. The chemoautotrophic treatment received no added carbohydrate, only shrimp feed. Each treatment was assigned randomly to four replicate tanks. Nitrate-N was significantly greater in the CA treatment, accumulating to a peak mean concentration of 162 mg NO3-N L−1 and nitrate was typically below detection (<0.01 mg NO3-N L−1) in the heterotrophic treatments. 5-Day biochemical oxygen demand (BOD5) was significantly greater in the heterotrophic treatments compared to the chemoautotrophic treatment. Total suspended solids concentration was significantly lower in the CA treatment compared to any other. Shrimp growth rate was significantly greater in the CA and HS treatments versus the HM treatment and there was no significant difference in growth rate between the HG treatment and any other treatment. These results indicate that differences in management and carbohydrate source can lead to substantial disparity in system function and shrimp production. |
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| Keywords: | Biofloc Shrimp Minimal exchange Heterotrophic Autotrophic |
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