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首页> 外文期刊>Latin american journal of aquatic research >Effect of a commercial probiotic on bacterial and phytoplankton concentration in intensive shrimp farming (Litopenaeus vannamei) recirculation systems
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Effect of a commercial probiotic on bacterial and phytoplankton concentration in intensive shrimp farming (Litopenaeus vannamei) recirculation systems

机译：商业性益生菌对集约化虾养殖（南美对虾）再循环系统中细菌和浮游植物浓度的影响

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The aim of this study was to evaluate the effect of a commercial probiotic on the bacterial and phytoplankton concentration in intensive shrimp farming (Litopenaeus vannamei) with a recirculation system, for one culture period in Rio Grande do Norte, Brazil. Ponds, with mean area of 2.6 ha, were stocked with a density of 98 shrimp m-2. A commercial probiotic was prepared following the manufacture's specifications and sprayed on the surface of the ponds seven days prior to stocking and then on a weekly basis until harvest. The same procedures were used with all treatments (control and probiotic), with regard to feeding, liming, fertilization, use of molasses and monitoring of water quality. Field data were analyzed using ANOVA, the Tukey test and Chi-square tests. No significant differences between treatments were found for water quality data, but treatment means showed significant differences for total heterotrophic bacteria in the sediment (5.181 ± 0.34x10(4) cfu g-1 and 5.749 ± 0.67x10(4) cfu g-1), total heterotrophic bacteria in surface water (4.514 ± 0.95x 10(4) cfu m L-1 and 4.136 ± 0.81x10(4) cfu m L-1) and positive sucrose in surface water (2.438 ± 0.72x10(4) cfu m L-1 and 2.203 ± 0.76x10(4) cfu m L-1), respectively, for the control and probiotic treatment. Significant differences were also observed throughout the weeks for total heterotrophic bacteria in the sediment, positive and negative sucrose in the sediment, total heterotrophic bacteria in surface and bottom water, and Pyrrophyta percentage values between 10 and 16 weeks. These results showed that the probiotic causes changes in the total heterotrophic bacteria in the sediment and percentage values of Pyrrophyta concentration, improving the environmental quality of the sediment and water in ponds with closed recirculation systems.
机译：这项研究的目的是在巴西里奥格兰德州的一个养殖期间，评估商业益生菌对采用再循环系统的集约化虾类养殖（南美对虾）中细菌和浮游植物浓度的影响。放养平均面积为2.6公顷的池塘，密度为98虾m-2。按照生产商的规格制备商业益生菌，并在放养前七天喷洒在池塘表面，然后每周一次直至收获。在喂养，撒石灰，施肥，糖蜜使用和水质监测方面，所有处理（对照和益生菌）均使用相同的程序。使用方差分析，Tukey检验和卡方检验分析了现场数据。水质数据在处理之间没有发现显着差异，但是处理手段显示出沉积物中总异养细菌的显着差异（5.181±0.34x10（4）cfu g-1和5.749±0.67x10（4）cfu g-1） ，地表水中的总异养细菌（4.514±0.95x 10（4）cfu m L-1和4.136±0.81x10（4）cfu m L-1）和地表水中的正蔗糖（2.438±0.72x10（4）cfu m L-1和2.203±0.76x10（4）cfu m L-1），分别用于对照和益生菌治疗。在整个星期内，沉积物中的总异养细菌，沉积物中的正，负蔗糖，地表水和底水中的总异养细菌以及焦斑藻百分比值在10周和16周之间也观察到了显着差异。这些结果表明，益生菌会导致沉积物中总异养细菌的变化和焦斑藻浓度的百分比值的变化，从而改善了封闭循环系统池塘中沉积物和水的环境质量。

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