Effects of dietary supplementation with powder of Antarctic krill (Euphausia superba) on growth performance, body composition and color of Litopenaeus vannamei
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摘要: 为探讨南极磷虾粉在对虾养殖中的应用效果,在对虾全价配合饲料中分别添加5% (S5组)、10% (S10组)、15% (S15组) 和20% (S20组) 的南极磷虾粉,配制成4种实验饲料,以全价配合饲料为对照 (S0组),饲养体质量为 (7.27±0.88) g 的凡纳滨对虾 (Litopenaeus vannamei) 35 d,研究了其对凡纳滨对虾生长、体组分及体色的影响。结果显示,饲料中添加南极磷虾粉:1) 可显著提高对虾成活率 (P<0.05),添加比例为15%时,终末体质量 (FBW)、体质量增长率 (WGR) 和特定生长率 (SGR) 均显著高于S0组 (P<0.05);2) 逐渐提高粗脂肪含量,且S10、S15和S20组显著高于S0组 (P<0.05),而头胸甲亮度值 (L*) 及身体处黄色值 (b*) 逐渐降低,均显著低于S0组 (P<0.05);3) 显著提高肝胰腺和甲壳中虾青素的含量,且与体色相关的LVPBP75基因的表达水平与南极磷虾粉添加比例呈正相关。研究结果初步表明,饲料中添加南极磷虾粉能够促进对虾生长,提高其体内虾青素含量和肝胰腺中LVPBP75的表达水平,改善体色;其中,添加15%的南极磷虾粉效果更加明显。Abstract: To determine the application effect of Euphausia superba powder (PE) in shrimp culture, we designed five groups [S0 group (No PE supplementation), S5 group, S10 group, S15 group, and S20 group (5%, 10%, 15% and 20% PE supplemented to the feed, respectively)] for a 35-day experiment on Litopenaeus vannamei [Body mass of (7.27±0.88) g]. The effect of dietary supplementation with PE on the growth performance, body composition and color of L. vannamei were evaluated. The results show that: 1) PE supplementation improved the survival rate (SR) of L. vannamei significantly (P<0.05), and the final body mass (FBW), weight gain rate (WGR) and specific growth rate (SGR) of L. vannamei in S15 group were significantly higher compared with the other groups (P<0.05). 2) With the increase of PE supplementation, the crude fat content of L. vannamei increased gradually, and those in S10 group, S15 group and S20 group were significantly higher than that in S0 group (P<0.05). Additionally, the brightness (L*) of the cephalothorax and the yellowness (b*) of the carapace of L. vannamei decreased gradually, which were significantly lower than those in S0 group (P<0.05). 3) PE supplementation to the feed increased the astaxanthin content in the hepatopancreas and crustacean of L. vannamei significantly (P<0.05), and the effect was positively associated with PE supplementation. The expression level of the LVPBP75 related to body color was also positively correlated with PE supplementation. The results indicate that dietary supplementation with PE, especially with 15% PE, can improve the growth, astaxanthin content, body color as well as expression level of LVPBP75 of L. vannamei.
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Key words:
- Litopenaeus vannamei /
- Euphausia superba powder /
- Body color /
- Astaxanthin /
- LVPBP75
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表 1 实验饲料营养水平分析 (风干质量)
Table 1. Nutritional composition of experimental diets (Air-dry mass)
项目Item 南极磷虾粉质量分数Mass fraction of E. superba powder/% 0 5 10 15 20 粗蛋白质量分数Crude protein mass fraction/% 44.68 44.17 45.32 45.36 45.37 粗脂肪质量分数Crude fat mass fraction/% 8.54 8.55 8.77 9.14 9.78 灰分质量分数Ash mass fraction/% 12.25 11.86 12.03 11.78 12.00 水分质量分数Moisture mass fraction/% 5.43 8.80 7.95 10.09 9.09 虾青素质量分数 Astaxanthin mass fraction/ (mg·kg−1) 1.19 1.68 2.05 2.66 2.96 表 2 本研究中使用的引物序列
Table 2. Real-time PCR primer sequences used in present study
引物Primer 引物序列 (5'—3') Primer sequence (5'–3') LVPBP75-F TGGGCATCCTTTGTCGGCAATG LVPBP75-R CATAGAGGGGAGGGAGCACCAC β-ACTIN-F ACCACCGCTGCTTCCTCCTC β-ACTIN-R CGGATGTCCACGTCGCACTTC 表 3 各组对虾生长性能和成活率
Table 3. Growth performance and survival rate of shrimps in each group
项目 Item 组别 Group S0 S5 S10 S15 S20 终末体质量 Final body mass/g 22.14±1.78b 23.62±3.02ab 25.10±3.76ab 26.35±2.56a 25.09±3.18ab 体质量增长率 Weight gain rate/% 204.41±24.53b 224.78±41.57ab 245.16±51.72ab 262.35±35.15a 245.03±43.78ab 特定生长率 Specific growth rate/(%·d−1) 3.17±0.24b 3.35±0.36ab 3.51±0.41ab 3.67±0.27a 3.52±0.35ab 成活率 Survival rate/% 46.67±0.00b 66.67±0.00ab 77.78±16.78a 66.67±0.00ab 57.78±10.18ab 注:同行数据不同小写字母表示差异显著 (P<0.05);下表同此。 Note: Values with different lowercase letters within the same row indicate significant difference (P<0.05). The same case in the following tables. 表 4 各组对虾体组分
Table 4. Body composition of shrimps in each group
% 项目Item 组别 Group S0 S5 S10 S15 S20 粗蛋白质 Crude protein 74.49±0.81a 73.03±1.16a 73.51±1.30a 75.53±1.16a 74.66±1.63a 粗脂肪 Crude fat 10.42±0.73de 11.57±0.50cd 12.34±0.75bc 13.18±0.21ab 14.46±0.32a 粗灰分 Ash 11.10±0.07 10.50±0.17 11.53±0.38 11.16±0.18 10.39±0.99 水分 Moisture 74.16±0.10 75.69±2.02 73.44±0.69 74.53±1.69 74.63±0.92 注:除水分数据是湿质量测量外,其他成分均为干质量测量。 Note: The crude protein, crude fat and ash are dry mass measurement, while the moisture is wet mass measurement. 表 5 各组对虾甲壳亮度值、红色值和黄色值
Table 5. L*, a*and b*of shrimp exoskeleton in each group
头胸甲 Cephalothorax 腹部甲壳 Carapace 亮度值 L* 红色值 a* 黄色值 b* 亮度值 L* 红色值 a* 黄色值 b* 生虾 Raw shrimp S0 44.69±2.07a 0.16±0.88 5.57±0.28a 36.55±1.83a 0.20±1.01 5.52±0.63a S5 39.43±2.61b 0.53±1.53 5.18±0.63ab 33.28±1.71bc 0.70±0.79 4.65±0.71a S10 34.53±1.31c −0.17±1.36 4.24±0.78bc 34.19±1.77b −0.11±0.28 2.09±0.66b S15 32.14±1.12d 0.70±1.05 4.53±0.74ab 31.46±1.96c −0.89±0.70 −1.26±1.25c S20 31.80±1.06d −0.38±0.62 3.54±0.56c 32.71±0.92bc 0.27±0.47 1.31±0.38b 熟虾 Cooked shrimp S0 43.62±0.98d 9.39±0.60b 11.24±1.16c 76.45±0.22a 9.94±0.35bc 16.06±0.78b S5 61.19±0.82b 9.23±0.33b 18.85±0.33b 71.48±0.28b 9.45±0.35c 13.22±0.29c S10 66.63±2.31a 9.28±2.13b 24.25±0.23a 69.08±0.48c 11.21±0.36b 16.42±1.00ab S15 56.43±2.64c 10.36±0.16ab 18.71±1.11b 65.25±0.20d 18.44±1.30a 15.95±0.24b S20 61.06±0.66b 13.69±1.65a 23.13±0.80a 62.88±0.73e 20.36±0.89a 17.71±0.35a -
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