Productive performance of juvenile freshwater prawns Macrobrachium rosenbergii in biofloc system
Productive performance of juvenile freshwater prawns Macrobrachium rosenbergii in biofloc system
复制标题
生物絮团系统中罗氏沼虾幼虾的生产性能
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Abreu
中科院分区：
文献类型：
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作者：
E. Ballester;Shayene Agatha Marzarotto;C. Castro;Amábile Frozza;I. Pastore;P. Abreu
本研究的目的是比较两种养殖系统的淡水虾罗氏沼虾：一个与使用的循环水养殖系统与生物过滤器（RAS）和另一个与使用的微生物絮凝体（F）。将30尾初始平均体重为0.13 ± 0.05 g的淡水对虾仔虾随机放养在6个面积为0.20 m2、容积为50 L的试验单元中。实验持续了30天。每天监测溶解氧、温度和pH值;每周测定三次氨浓度;每周测定亚硝酸盐浓度、碱度和硬度。为了形成微生物絮凝物，使用糖蜜来保持氨浓度在对虾养殖的安全水平内。水质的变量保持在合适的范围内生产的物种，除了氨浓度在F处理，超过了安全水平。在实验结束时，评价以下参数：存活率、特定生长率、增重和饲料转化率。仅在饲料转化率方面存在差异，RAS处理具有更好的值。还评价了RAS和F处理中存在的微生物。轮虫、变形虫和总细菌的密度在F处理时较高，尽管在RAS处理时发现了相同的生物体。本研究结果表明，用人工饲养的方法饲养M.生物絮体系统技术领域的罗森伯格。
The aim of this study was to compare two rearing systems for freshwater prawn Macrobrachium rosenbergii: one with use of a recirculating aquaculture system with biofilters (RAS) and another with use of microbial flocs (F). Thirty postlarvae of freshwater prawn with an initial average weight of 0.13 ± 0.05 g were randomly stocked in six experimental units with 0.20 m² and volume of 50 L. The experiment lasted thirty days. Dissolved oxygen, temperature and pH were monitored daily; ammonia concentration was determined three times per week; nitrite concentration, alkalinity and hardness were measured weekly. For the formation of microbial floc, molasses was used to keep the ammonia concentrations within safe levels for prawn farming. The variables of water quality remained within the suitable range for the production of the species, except for ammonia concentrations at the F treatment, which exceeded the safe levels. At the end of the experiment, the following parameters were evaluated: survival, specific growth rate, weight gain and feed conversion rate. Differences were found only in feed conversion rate with better values on RAS treatment. The microorganisms present in the RAS and F treatment were also evaluated. The densities of rotifers, amoebas and total bacteria were higher at the F treatment although the same organisms were found at the RAS treatment. The results of this study showed the possibility of rearing M. rosenbergii in biofloc system technology.