1 材料与方法
1.1 试验材料
1.2 牟氏角毛藻营养成分测定
1.2.1 常规营养成分测定
1.2.2 氨基酸的评价方法
1.3 育苗试验
1.3.1 试验设计
1.3.2 水质理化检测
1.3.3 出苗率和饵料消耗量计算
1.3.4 仔虾生长、消化酶和免疫因子活性检测
1.3.5 应激试验
1.4 数据分析与处理
2 结果
2.1 牟氏角毛藻营养成分
2.1.1 常规营养成分
2.1.2 氨基酸组成、含量与评价
表1 牟氏角毛藻氨基酸组成和含量(干物质基础)Table 1 Amino acid compositions and contents of Chaetoceros muelleri (DM basis) % |
| 氨基酸 Amino acids | 含量 Content | 氨基酸 Amino acids | 含量 Content | 氨基酸 Amino acids | 含量 Content | ||
|---|---|---|---|---|---|---|---|
| 天门冬氨酸Asp | 2.83±0.16 | 半胱氨酸Cys | 0.15±0.03 | 苯丙氨酸Phe | 1.47±0.10 | ||
| 苏氨酸Thr | 1.26±0.09 | 缬氨酸Val | 1.58±0.07 | 赖氨酸Lys | 1.59±0.12 | ||
| 丝氨酸Ser | 1.28±0.11 | 蛋氨酸Met | 0.44±0.05 | 组氨酸His | 0.45±0.03 | ||
| 谷氨酸Glu | 3.53±0.20 | 异亮氨酸Ile | 1.47±0.08 | 精氨酸Arg | 1.32±0.08 | ||
| 甘氨酸Gly | 1.54±0.08 | 亮氨酸Leu | 2.12±0.09 | 脯氨酸Pro | 1.13±0.07 | ||
| 丙氨酸Ala | 2.15±0.17 | 酪氨酸Tyr | 0.68±0.04 |
表2 牟氏角毛藻必需氨基酸组成的评价Table 2 Evaluation of essential amino acid composition of Chaetoceros muelleri |
| 必需氨基酸 Essential amino acids | 牟氏角毛藻 Chaetoceros muelleri/(mg/g) | 全鸡蛋蛋白质 Egg protein/ (mg/g) | FAO/WHO评分模式 FAO/WHO scoring pattern | 氨基酸评分 AAS | 化学评分 CS |
|---|---|---|---|---|---|
| 异亮氨酸Ile | 91.875 | 331 | 250 | 0.368 | 0.278 |
| 亮氨酸Leu | 132.500 | 534 | 440 | 0.301 | 0.248 |
| 赖氨酸Lys | 99.375 | 441 | 340 | 0.292 | 0.225 |
| 苏氨酸Thr | 78.750 | 292 | 250 | 0.315 | 0.270 |
| 缬氨酸Val | 98.750 | 411 | 310 | 0.319 | 0.240 |
| 蛋氨酸+半胱氨酸Met+Cys | 36.785 | 386 | 220 | 0.167 | 0.095 |
| 苯丙氨酸+酪氨酸Phe+Tyr | 134.285 | 565 | 380 | 0.353 | 0.238 |
| 总计Total | 672.320 | 2 960 | 2 190 |
2.1.3 脂肪酸组成和含量
表3 牟氏角毛藻脂肪酸组成和含量Table 3 Fatty acid compositions and contents of Chaetoceros muelleri % |
| 脂肪酸 Fatty acids | 含量 Content | 脂肪酸 Fatty acids | 含量 Content | 脂肪酸 Fatty acids | 含量 Content | ||
|---|---|---|---|---|---|---|---|
| C12∶0 | 0.10±0.00 | C24∶0 | 0.10±0.00 | C20∶3n6c | 0.20±0.00 | ||
| C14∶0 | 16.02±0.58 | C16∶1n7c | 36.64±1.23 | C20∶4n6c | 0.50±0.01 | ||
| C15∶0 | 0.96±0.01 | C17∶1n7c | 5.21±0.06 | C20∶5n3c | 4.70±0.06 | ||
| C16∶0 | 17.41±0.45 | C18∶1n9c | 0.52±0.03 | C22∶6n3c | 0.20±0.00 | ||
| C17∶0 | 4.30±0.05 | C18∶2n6c | 1.20±0.12 | 其他Other | 10.31±0.38 | ||
| C18∶0 | 0.41±0.00 | C18∶3n6c | 0.20±0.00 | ∑SFA | 39.40±1.03 | ||
| C20∶0 | 0.10±0.00 | C18∶3n3c | 0.92±0.02 | ∑UFA | 50.29±2.06 |
SFA:饱和脂肪酸saturated fatty acids;UFA:不饱和脂肪酸unsaturated fatty acids。 |
2.2 不同牟氏角毛藻添加量对育苗水质的影响
表4 牟氏角毛藻对育苗水质的影响Table 4 Effects of Chaetoceros muelleri on breeding water quality |
| 项目 Items | 组别 Groups | 无节幼体 Nauplius | 溞状幼体Ⅱ期 Zoea Ⅱ period | 糠虾幼体Ⅱ期 Mysis Ⅱ period | 仔虾期(第5天) Postlavae period (day 5) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 溶解氧 D.O/ (mg/L) | 对照组Control group | 6.72±0.11A | 6.23±0.12B | 5.62±0.10C | 5.18±0.09D | ||||||
| 试验组Ⅰ Test group Ⅰ | 6.72±0.09A | 6.25±0.11B | 5.65±0.11C | 5.20±0.11D | |||||||
| 试验组Ⅱ Test group Ⅱ | 6.73±0.10A | 6.31±0.11B | 5.70±0.12C | 5.19±0.10D | |||||||
| 试验组Ⅲ Test group Ⅲ | 6.73±0.10A | 6.51±0.13B | 5.73±0.12C | 5.21±0.12D | |||||||
| 试验组Ⅳ Test group Ⅳ | 6.72±0.09A | 6.45±0.13B | 5.75±0.12C | 5.20±0.11D | |||||||
| pH | 对照组Control group | 8.23±0.07A | 8.15±0.03B | 7.95±0.04C | 7.78±0.03D | ||||||
| 试验组Ⅰ Test group Ⅰ | 8.21±0.05A | 8.14±0.03B | 7.96±0.04C | 7.80±0.03D | |||||||
| 试验组Ⅱ Test group Ⅱ | 8.22±0.07A | 8.15±0.02B | 8.01±0.05C | 7.81±0.05D | |||||||
| 试验组Ⅲ Test group Ⅲ | 8.23±0.06A | 8.16±0.02B | 8.06±0.03C | 7.82±0.05D | |||||||
| 试验组Ⅳ Test group Ⅳ | 8.25±0.04A | 8.15±0.03B | 8.03±0.05C | 7.76±0.04D | |||||||
| 活性磷酸盐 P -P/ (mg/L) | 对照组Control group | 0.003±0.002A | 0.022±0.008aB | 0.040±0.010aC | 0.071±0.012aD | ||||||
| 试验组Ⅰ Test group Ⅰ | 0.003±0.002A | 0.020±0.008aB | 0.037±0.010aC | 0.064±0.016abD | |||||||
| 试验组Ⅱ Test group Ⅱ | 0.003±0.002A | 0.021±0.007aB | 0.032±0.009abC | 0.052±0.013bD | |||||||
| 试验组Ⅲ Test group Ⅲ | 0.003±0.002A | 0.017±0.009bB | 0.028±0.008bC | 0.050±0.015bD | |||||||
| 试验组Ⅳ Test group Ⅳ | 0.003±0.002A | 0.016±0.009bB | 0.030±0.009bC | 0.051±0.014bD | |||||||
| 硝酸盐氮 N -N/ (mg/L) | 对照组Control group | 0.168±0.043A | 0.295±0.042bB | 0.543±0.061aC | 0.662±0.045D | ||||||
| 试验组Ⅰ Test group Ⅰ | 0.163±0.051A | 0.287±0.038abB | 0.521±0.073aC | 0.673±0.048D | |||||||
| 试验组Ⅱ Test group Ⅱ | 0.164±0.051A | 0.251±0.033aB | 0.506±0.070bC | 0.663±0.047D | |||||||
| 试验组Ⅲ Test group Ⅲ | 0.165±0.050A | 0.242±0.032aB | 0.475±0.076bC | 0.653±0.053D | |||||||
| 试验组Ⅳ Test group Ⅳ | 0.167±0.050A | 0.245±0.035aB | 0.497±0.083bC | 0.641±0.057D | |||||||
| 亚硝酸盐氮 N -N/ (mg/L) | 对照组Control group | 0.017±0.007A | 0.033±0.013aB | 0.052±0.015aC | 0.065±0.011aD | ||||||
| 试验组Ⅰ Test group Ⅰ | 0.017±0.007A | 0.030±0.010aB | 0.049±0.018aC | 0.061±0.013aD | |||||||
| 试验组Ⅱ Test group Ⅱ | 0.018±0.006A | 0.028±0.011aB | 0.045±0.017abC | 0.053±0.013abD | |||||||
| 试验组Ⅲ Test group Ⅲ | 0.017±0.007A | 0.027±0.014bB | 0.041±0.010bC | 0.050±0.013bD | |||||||
| 试验组Ⅳ Test group Ⅳ | 0.018±0.005A | 0.027±0.012bB | 0.039±0.018bC | 0.049±0.013bD | |||||||
| 铵态氮 N -N/ (mg/L) | 对照组Control group | 0.031±0.008A | 0.092±0.029aB | 0.140±0.022aC | 0.168±0.041aD | ||||||
| 试验组Ⅰ Test group Ⅰ | 0.030±0.009A | 0.085±0.025aB | 0.133±0.023aC | 0.159±0.051aD | |||||||
| 试验组Ⅱ Test group Ⅱ | 0.031±0.009A | 0.071±0.019bB | 0.120±0.026bC | 0.143±0.040bD | |||||||
| 试验组Ⅲ Test group Ⅲ | 0.032±0.009A | 0.070±0.021bB | 0.110±0.026cC | 0.140±0.038bD | |||||||
| 试验组Ⅳ Test group Ⅳ | 0.029±0.010A | 0.070±0.022bB | 0.108±0.026cC | 0.138±0.039bD | |||||||
| 化学需氧量 COD/ (mg/L) | 对照组Control group | 2.252±0.271A | 4.321±0.315aB | 5.538±0.671aC | 6.742±0.428aD | ||||||
| 试验组Ⅰ Test group Ⅰ | 2.301±0.365A | 3.805±0.356bB | 5.067±0.546bC | 6.031±0.435bD | |||||||
| 试验组Ⅱ Test group Ⅱ | 2.284±0.372A | 3.324±0.330cB | 4.841±0.357bC | 5.831±0.423bD | |||||||
| 试验组Ⅲ Test group Ⅲ | 2.249±0.381A | 3.273±0.325cB | 4.423±0.221cC | 5.331±0.411cD | |||||||
| 试验组Ⅳ Test group Ⅳ | 2.241±0.392A | 3.011±0.310cB | 4.383±0.254cC | 5.237±0.403cD | |||||||
同列数据肩标不同小写或同行数据肩标不同大写字母表示差异显著(P<0.05),无字母或相同字母表示差异不显著(P>0.05)。 | |
In the same column, values with different small letter superscripts or in the same row, values with different capital letter superscripts mean significant difference (P<0.05),and no letter or the same letter superscripts mean no significant difference (P>0.05). |
2.3 不同牟氏角毛藻添加量对仔虾生长、出苗率和饵料消耗量的影响
表5 牟氏角毛藻对仔虾生长、出苗率和饵料消耗量的影响Table 5 Effects of Chaetoceros muelleri on growth, emergence rate and feed consumption of shrimp larvae |
| 组别 Groups | 全长 Full length/mm | 出苗率 Emergence rate/% | 饵料消耗量 Feed consumption/(g/万尾) |
|---|---|---|---|
| 对照组Control group | 8.54±0.70b | 50.37±8.28d | 26.82±4.25b |
| 试验组Ⅰ Test group Ⅰ | 8.60±0.78b | 55.51±6.57c | 25.91±5.12b |
| 试验组Ⅱ Test group Ⅱ | 8.62±0.82b | 60.09±7.00b | 22.26±4.37a |
| 试验组Ⅲ Test group Ⅲ | 8.81±0.65a | 68.39±5.12a | 22.14±4.83a |
| 试验组Ⅳ Test group Ⅳ | 8.86±0.58a | 70.39±9.86a | 21.87±4.65a |
同列数据肩标不同小写字母表示差异显著(P<0.05)。 | |
In the same colum, values with different small letter superscripts mean significant difference (P<0.05). The same as |
2.4 不同牟氏角毛藻添加量对仔虾消化酶活性的影响
表6 牟氏角毛藻对仔虾消化酶活性的影响Table 6 Effects of Chaetoceros muelleri on digestive enzyme activities of shrimp larvae U/mg prot |
| 组别 Groups | 淀粉酶 Amylase | 脂肪酶 Lipase | 蛋白酶 Protease |
|---|---|---|---|
| 对照组Control group | 38.51±1.26b | 13.57±1.58c | 175.24±15.24c |
| 试验组Ⅰ Test group Ⅰ | 38.81±1.53ab | 14.85±2.16b | 191.25±12.31b |
| 试验组Ⅱ Test group Ⅱ | 39.03±1.53ab | 17.26±2.23a | 198.32±12.31a |
| 试验组Ⅲ Test group Ⅲ | 39.42±1.53ab | 17.88±2.58a | 201.64±12.31a |
| 试验组Ⅳ Test group Ⅳ | 41.65±1.53a | 18.08±1.86a | 205.27±12.31a |
2.5 不同牟氏角毛藻添加量对仔虾抗氧化酶和免疫酶活性的影响
表7 牟氏角毛藻对仔虾抗氧化酶和免疫酶活性的影响Table 7 Effects of Chaetoceros muelleri on antioxidative and immune enzyme activities of shrimp larvae U/mL |
| 组别 Groups | 总抗氧化能力 T-AOC | 超氧化物歧化酶 SOD | 过氧化物酶 POD | 酸性磷酸酶 ACP | 碱性磷酸酶 AKP |
|---|---|---|---|---|---|
| 对照组Control group | 3.38±2.12c | 22.68±2.25c | 3.62±1.27c | 2.87±0.12 | 3.32±0.16 |
| 试验组ⅠTest group Ⅰ | 4.27±1.72b | 24.37±2.62b | 4.53±1.45b | 2.91±0.17 | 3.38±0.25 |
| 试验组Ⅱ Test group Ⅱ | 4.36±1.68b | 27.52±2.62a | 5.55±1.45a | 2.95±0.25 | 3.41±0.24 |
| 试验组Ⅲ Test group Ⅲ | 4.87±1.51a | 27.86±2.62a | 5.65±1.45a | 2.96±0.27 | 3.43±0.21 |
| 试验组Ⅳ Test group Ⅳ | 5.06±1.85a | 28.65±2.62a | 5.71±1.45a | 3.05±0.29 | 3.45±0.19 |
2.6 不同牟氏角毛藻添加量对仔虾抗逆性能的影响
表8 甲醛应激下仔虾存活率比较Table 8 Comparison of survival rate under formaldehyde stress of shrimp larvae % |
| 时间 Time/h | 对照组 Control group | 试验组Ⅰ Test group Ⅰ | 试验组Ⅱ Test group Ⅱ | 试验组Ⅲ Test group Ⅲ | 试验组Ⅳ Test group Ⅳ |
|---|---|---|---|---|---|
| 0 | 100.00±0.00 | 100.00±0.00 | 100.00±0.00 | 100.00±0.00 | 100.00±0.00 |
| 2 | 100.00±0.00 | 100.00±0.00 | 100.00±0.00 | 100.00±0.00 | 100.00±0.00 |
| 4 | 96.67±2.63b | 100.00±0.00a | 100.00±0.00a | 100.00±0.00a | 100.00±0.00a |
| 6 | 91.67±2.37c | 96.67±2.25b | 100.00±0.00a | 100.00±0.00a | 100.00±0.00a |
| 8 | 85.00±2.59d | 91.67±2.36c | 95.00±5.00b | 96.33±2.65b | 100.00±0.00a |
| 10 | 78.33±5.77c | 87.33±1.35b | 90.00±7.36b | 91.67±6.73b | 96.67±3.51a |
| 12 | 73.33±0.40d | 83.33±7.64c | 86.33±2.89b | 87.67±2.89b | 91.67±2.89a |
| 14 | 70.00±5.00d | 80.00±8.32c | 83.33±4.23b | 83.33±5.65b | 86.67±2.35a |
| 16 | 65.33±2.21c | 72.67±5.31b | 76.67±7.64b | 78.67±2.08b | 81.33±2.39a |
| 18 | 58.33±2.89d | 65.33±1.55c | 69.33±2.89b | 70.67±7.24b | 78.33±5.35a |
| 20 | 53.33±5.77d | 60.33±5.27c | 65.00±2.31b | 66.33±5.21b | 71.67±7.64a |
| 22 | 50.00±5.00d | 55.67±3.77b | 58.00±5.00b | 58.67±5.77b | 66.33±5.21a |
| 24 | 43.67±7.64d | 48.67±2.34c | 53.67±2.35b | 54.33±5.26b | 60.00±5.31a |
同行数据肩标不同小写字母表示差异显著 (P<0.05)。 | |
In the same row, values with different small letter superscripts mean significant differences (P<0.05). |
3 讨论
3.1 牟氏角毛藻营养特性
表9 牟氏角毛藻与其他微藻EPA和DHA的比较Table 9 Comparison of EPA and DHA of Chaetoceros muelleri with the other microalgae % |
| 项目 Items | 牟氏角毛藻 Chaetoceros muelleri | 三角褐指藻 Phaeodactylum tricornutum Bohlin | 小球藻 Clorellas sp. | 青岛大扁藻 Platymonas helgolandica | 亚心形扁藻 Platymonas subcordiformis |
|---|---|---|---|---|---|
| 二十碳五烯酸 EPA | 4.7、7.48[24]、23.8[20]、 13.04[21]、7.8[22] | 16.63[24]、29.7[20])、 27.03[21]、11.7[22] | 10.95[24]、 29.3[20] | 5.8[24]、9.7[20] | 5.40[24]、5.1[20]、 4.33[21] |
| 二十二碳六烯酸 DHA | 0.2、0.58[24]、1.4[20]、 0.94[21]、0.3[22] | 4.61[24]、1.8[20]、 1.46[21]、0.46[22] |

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