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首页> 外文期刊>Aquacultural Engineering: An International Journal >Intensive nursery production of the Pacific white shrimp Litopenaeus vannamei using two commercial feeds with high and low protein content in a biofloc-dominated system.
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Intensive nursery production of the Pacific white shrimp Litopenaeus vannamei using two commercial feeds with high and low protein content in a biofloc-dominated system.

机译：在生物絮凝物为主的系统中，使用两种蛋白质含量高和低的商业饲料，对太平洋白虾凡纳滨对虾进行集约化育苗。

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摘要

The efficiency of shrimp production in limited exchange systems can be improved by optimizing the protein content of the feed. Therefore, a 62-d nursery study was conducted with 10-day-old Litopenaeus vannamei postlarvae stocked (5000 PL10 m-3) in four 40 m3 raceways to evaluate the effect of high (40%) and low (30%) crude-protein (HP40 and LP30, respectively) diets and molasses supplementation on selected water quality indicators and shrimp performance under limited water exchange. Each raceway was equipped with a real-time dissolved oxygen monitoring system and a foam fractionator to control particulate matter. The level of molasses used in this study was effective in preventing significant ammonia accumulation in the culture medium. However, these supplementation levels were not effective in preventing nitrite accumulation. The HP40 treatment had significantly higher nitrite, nitrate and phosphate concentrations than the LP30 treatment. Shrimp mean final weight (0.94 vs. 1.03 g) and specific growth rate (SGR) (11.03 vs. 11.19% day-1) were significantly different between treatments (P<0.05) LP30 and HP40, respectively, while mean survival (~82% vs. 84%) and protein efficiency ratio (PER) (3.89 vs. 3.28) were not (P>0.05). The data suggest that substituting high-protein (40%) with low-protein (30%) feed in the nursery phase in a biofloc dominated system operated with minimal discharge may provide an alternative to improve shrimp biofloc technology, through improved water quality, cheaper (lower protein) feed and reduced environmental impact.
机译：通过优化饲料中的蛋白质含量，可以提高有限交换系统中虾的生产效率。因此，我们在4个40 m 3的10天龄南美白对虾对虾（5000 PL 10 m -3 ）中进行了62天的保育研究。 跑道，以评估高（40％）和低（30％）粗蛋白（分别为HP40和LP30）日粮和糖蜜添加对有限水交换条件下所选水质指标和虾性能的影响。每个滚道都配备了实时溶解氧监测系统和泡沫分馏器，以控制颗粒物。本研究中使用的糖蜜水平可以有效防止培养基中氨的大量积累。但是，这些补充水平不能有效地防止亚硝酸盐积累。与LP30处理相比，HP40处理的亚硝酸盐，硝酸盐和磷酸盐浓度明显更高。 LP30和HP40的虾平均最终体重（0.94比1.03 g）和比生长率（SGR）（11.03比11.19％day -1 ）显着不同（P <0.05） ，而平均存活率（〜82％vs. 84％）和蛋白质效率比（PER）（3.89 vs. 3.28）则没有（P> 0.05）。数据表明，在以最小排放量运行的生物絮凝物为主的系统中，在育苗阶段将高蛋白（40％）换成低蛋白（30％）饲料，可以通过改善水质，降低成本来提供改进虾生物絮凝技术的替代方案。 （蛋白质含量较低）饲料，并减少对环境的影响。

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