Effect of light limitation on the water quality,bacterial counts and performance of Litopenaeus vannamei postlarvae reared with biofloc at low salinity |
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| Authors: | Héctor M Esparza‐Leal Ely S López‐Álvarez Jesús T Ponce‐Palafox Josué A Melendrez‐Soto Marco A Medina‐Astorga Antonio Luna‐González Wenceslao Valenzuela‐Quiñónez Píndaro Álvarez‐Ruiz Gerardo Rodríguez‐Quiroz |
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| Affiliation: | 1. Instituto Politécnico Nacional‐Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional Unidad Sinaloa, Guasave, Sinaloa, Mexico;2. CENITT, Posgrado CBAP, Escuela Nacional de Ingeniería Pesquera, Universidad Autónoma de Nayarit, Tepic, Nayarit, Mexico;3. Undergraduate Student in the Industrial Engineer Program, Universidad Estatal de Sonora, Hermosillo, Sonora, Mexico;4. Undergraduate Student in the Aquaculture Program, Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Mazatlán, Sinaloa, Mexico |
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| Abstract: | The aim of this study was to evaluate the effect of light limitation on the water quality, bacterial counts and performance of Litopenaeus vannamei postlarvae reared with biofloc at low salinity (≈9 g L?1). Two treatments were designed: T1 = culture with natural sunlight and T2 = culture in darkness. After 28 days, in both treatments, the final weight of shrimp was over 0.6 g with a specific growth rate over 7.4% d?1, and a survival rate over 70%. In both treatments, Vibrio sp. concentration presented low values (culture with natural sunlight = 0.1 to 9.9 × 102 CFU mL?1, culture in darkness = 0.4 to 11.7 × 102 CFU mL?1) and Bacillus sp. had high values (culture with natural sunlight = 0.7 to 66.0 × 104 CFU mL?1, culture in darkness = 0.7 to 65.8 × 104 CFU mL?1). All water quality parameters remained within the ranges suitable for shrimp culture, except for alkalinity during the first stage of the study. Although in some sampling periods some significant differences were found in bacterial counts and water quality parameters, shrimp productive performance under culture with biofloc at low salinity was not affected significantly by light limitation. |
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| Keywords: | shrimp performance biofloc bacteria water quality |
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