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首页> 外文期刊>Aquaculture >The size of biofloc determines the nutritional composition and the nitrogen recovery by aquaculture animals.
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The size of biofloc determines the nutritional composition and the nitrogen recovery by aquaculture animals.

机译：生物絮凝物的大小决定了水产养殖动物的营养成分和氮的回收率。

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The effect of biofloc size on the nutritional composition of the flocs and the nitrogen utilization by white shrimp (Litopenaeus vannamei), red tilapia (Oreochromis niloticus) and mussels (Perna viridis) was investigated. Biofloc was collected from a shrimp culture unit and labeled with (15NcH4)2SO4. The flocs were sieved grouping them into 4 different size classes (un-sieved, <48 micro m, 48-100 micro m, and >100 micro m) and subsequently offered to shrimp, red tilapia and mussels. The biofloc class of >100 micro m contained the highest levels of protein (27.8%) and lipid (7.5%), whereas the biofloc of <48 micro m seemed to be richest in essential amino acids. Based on the Essential Amino Acid Index (EAAI), biofloc produced in this study can be considered as a good quality protein source for shrimp (0.93-0.97) and a useful protein source for tilapia (0.83-0.90) and mussel (0.81-0.88). The total amount of nitrogen that could be derived from biofloc was the highest when the biofloc was larger than 100 micro m, i.e. 4.06 g N/kg shrimp, 3.79 g N/kg tilapia, and 1.17 g N/kg mussel, respectively. The nitrogen recovery from the biofloc, however, was the highest when the floc was <48 micro m. Overall, this study showed that biofloc consumption by shrimp, red tilapia and mussels occurs irrespective of floc size but that floc size can play an important role in the quality of biofloc in terms of nutritional composition and nitrogen retention by the animals.
机译：研究了生物絮凝物大小对絮凝物营养成分和白虾（对虾凡纳滨对虾），红罗非鱼（对虾紫罗兰）和贻贝（对虾）的氮素利用的影响。从虾类养殖单位收集生物絮凝剂，并用（ 15 NcH 4 ） 2 SO 4 标记。将絮状物过筛，将它们分为4种不同大小的类别（未过筛，<48微米，48-100微米和> 100微米），然后提供给虾，罗非鱼和贻贝。 > 100微米的生物絮凝物含有最高水平的蛋白质（27.8％）和脂质（7.5％），而<48微米的生物絮凝物似乎富含必需氨基酸。根据必需氨基酸指数（EAAI），本研究中生产的生物絮凝剂可被视为虾的优质蛋白质来源（0.93-0.97），罗非鱼（0.83-0.90）和贻贝的有用蛋白质来源（0.81-0.88） ）。当生物絮凝物大于100微米时，可从生物絮凝物中获得的氮总量最高，即分别为4.06 g N / kg虾，3.79 g N / kg罗非鱼和1.17 g N / kg贻贝。但是，当絮凝物小于48微米时，从生物絮凝物中回收的氮最高。总体而言，这项研究表明，无论絮凝物的大小如何，虾，红罗非鱼和贻贝都会消耗生物絮凝物，但絮凝物的大小对动物的营养成分和氮素的保留具有重要作用。

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