Dietary supplementation of Aurantiochytrium sp. meal, a docosahexaenoic-acid source, promotes growth of Nile tilapia at a suboptimal low temperature
Dietary supplementation of Aurantiochytrium sp. meal, a docosahexaenoic-acid source, promotes growth of Nile tilapia at a suboptimal low temperature
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DOI：
10.1016/j.aquaculture.2019.04.030
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发表时间：
2019-05-30
期刊：
影响因子：
4.5
通讯作者：
Fracalossi, Debora Machado
中科院分区：
文献类型：
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作者：
Nobrega, Renata Oselame;Batista, Rosana Oliveira;Fracalossi, Debora Machado
关于尼罗罗非鱼在低温下饲养的脂肪酸需要量的信息很少。外温性动物，如罗非鱼，在寒冷的温度下倾向于增加其细胞膜脂肪酸的不饱和度，以维持细胞膜的功能。因此，我们在22摄氏度的低温下饲养尼罗罗非鱼幼鱼(8.47+/-0.19g)，添加四种不同浓度的金藻。膳食(0.5、1.0、2.0和4.0g 100g(-1)干饲料)是二十二碳六烯酸(22：6n-3，DHA)的来源，以评估其对生长、营养保留量和消化率的影响。我们还包括添加鱼肝油(CLO)的阳性对照日粮，其DHA浓度与添加1.0g 100g(-1)金藻的日粮相似。膳食，以便比较两种富含DHA的食物来源。每天给鱼喂两次实验饲料，以达到明显的饱腹感，持续87天。提高金环藻的饲料浓度。日粮对生长、饲料效率、蛋白质存留率和体内DHA含量有正向影响。以金藻为食的鱼。与喂食CLO饮食的鱼相比，膳食的体重增加明显更多。金环藻的饲料补充研究。膳食对尼罗罗非鱼肌肉中n-3脂肪酸的含量也有积极的影响，从而导致更高的DHA浓度。与摄食1.0g 100g(-1)金藻的鱼相比，投喂ClO饲料的鱼积累了更多的DHA。吃饭。金环藻对部分营养物质的消化率。DHA在尼罗罗非鱼中的消化率很高(96.05%)，但蛋白质、脂肪和饱和脂肪酸的消化率降低。在本研究中，我们发现了金黄色葡萄球菌的补充剂。饲料中添加0.43~1.00g 100(-1)干饲料的尼罗罗非鱼保持在22℃时，其生长、饲料效率、体脂组成和肌肉中适宜的n-3/n-6多不饱和脂肪酸比例最高。
Information regarding the fatty-acid requirements of Nile tilapia raised in cold-suboptimal temperatures is scarce. Ectothermic animals, such as tilapia, tend to increase the degree of unsaturation in their membrane fatty-acids in cold temperatures to maintain cell membrane function. Therefore, we fed Nile tilapia juveniles (8.47 +/- 0.19 g) at a cold suboptimal temperature of 22 degrees C, with four different supplement concentrations of Aurantiochytrium sp. meal (0.5, 1.0, 2.0, and 4.0 g 100 g(-1) dry diet), a source of docosahexaenoic acid (22: 6 n-3, DHA), to assess its effect on growth, nutrient retention, and digestibility. We also included a positive control diet with cod liver oil (CLO), containing a DHA concentration similar to the diet supplemented with 1.0 g 100 g(-1) Aurantiochytrium sp. meal, to allow for a comparison of two DHA-rich food sources. Fish were fed the experimental diets twice a day to apparent satiation for 87 days. Increasing dietary concentrations of Aurantiochytrium sp. meal affected growth, feed efficiency, protein retention, and body DHA content positively. Fish fed Aurantiochytrium sp. meal had significantly greater weight gains when compared to fish fed the CLO diet. The dietary supplementation of Aurantiochytrium sp. meal also positively influenced the n-3 fatty acid profile in the muscle of the Nile tilapia, resulting in higher DHA concentrations. Fish fed the CLO diet accumulated significantly more DHA, compared to those fed the 1.0 g 100 g(-1) Aurantiochytrium sp. meal. The digestibility of selected nutrients from the Aurantiochytrium sp. meal was determined in fish weighing 16.01 +/- 0.68 g, at 22 degrees C. DHA had high digestibility (96.05%) in Nile tilapia, even at the suboptimal temperature, but the digestibility of proteins, lipids, and saturated fatty acids, were decreased. In this study, we found supplementation of Aurantiochytrium sp. meal at 0.43 to 1.00 g 100(-1) dry diet for Nile tilapia kept at 22 degrees C resulted in best growth, feed efficiency, body lipid composition, and adequate n-3/n-6 polyunsaturated-fatty-acid ratio in the muscle for human consumption.