Journal of Tropical Oceanography >
Effects of breeding density on the growth, metabolic enzyme activity and related gene expression level of juvenile Pampus argenteus
Received date: 2019-05-07
Request revised date: 2019-07-25
Online published: 2020-03-10
Supported by
National Natural Science Foundation of China(31772869)
National Natural Science Foundation of China(31872586)
Natural Science Foundation of Zhejiang Province(LY15C190003)
Natural Science Foundation of Zhejiang Province(LY18C190008)
Special Funds for Key Project of Science and Technology of Ningbo(2019C02059)
Copyright
The feeding experiment lasted for 40 days to explore the effects of breeding density (30, 60 and 90 individuals·m-3) on the growth, enzyme activity and mRNA expression of aspartate aminotransferase (AST), alanine aminotransferase (ALT) and lactate dehydrogenase (LDH) in liver and kidney of juvenile Pampus argenteus with an average body weight of (3.88±0.72) g. Results are as follows. The weight gain rate and specific growth rate of the 60 individuals·m -3 group were (235.19±10.23)% and (4.03±0.10)%, respectively, which were significantly higher than those in the 30 individuals·m-3 group (p<0.05), but showed no significant differences with the 90 individuals·m-3 group (p>0.05). The changes of enzyme activity of juvenile Pampus argenteus were the most significant in the 90 individuals·m-3 group and were the least significant in the 30 individuals·m-3group. The activities of LDH, ALT and AST in liver and kidney increased first and then decreased, and the values of the three enzyme activities reached the peak at 6 h, 10 d and 10 d, respectively, which were 2.0 times, 4.3 times and 2.0 times of the initial values. The peak values of the three enzyme activities appeared at 1 d, 3 d and 5 d in kidney, respectively, and the values were 2.1 times, 2.2 times and 3.1 times of the initial values. The changes of mRNA expression of AST, ALT and LDH genes and the changes of the three enzyme activities in liver and kidney showed significant correlations. In conclusion, the breeding density of 60 individuals·m-3 could promote the growth of juvenile Pampus argenteus. However, the 90 individuals·m-3 group might cause extra energy demand increases in Pampus argenteus juveniles. Increased expression of gluconeogenesis-related genes mRNA resulted in significant increases of AST, ALT and LDH activities in liver and kidney, and eventually slowed down the growth of juvenile Pampus argenteus.
NI Jiahao , ZHU Xiaojing , JI Yiping , ZHOU Bin , WANG Yajun , XU Shanliang , WANG Danli . Effects of breeding density on the growth, metabolic enzyme activity and related gene expression level of juvenile Pampus argenteus[J]. Journal of Tropical Oceanography, 2020 , 39(2) : 54 -64 . DOI: 10.11978/2019045
表1 AST、ALT和LDH基因荧光定量PCR所用引物Tab. 1 Primer used for AST, ALT and LDH qRT-PCR |
引物 | 序列(5'—3') | 片段大小/bp | 退火温度/℃ |
---|---|---|---|
AST-F AST-R | AGTGGAAGGAGATTGCTGACATTGT ACTCCACTCTCTTTGCCTCATCTGT | 242 | 58 |
ALT-F ALT-R | TCATCAAACTGGTGTCGGTGCG TGTGGTGTAGGAGGGCTCATCAGGC | 103 | 61 |
LDH-F LDH-R | GCGACAAAGACTACAGCGTGAC CGATGTTGGGGATGATAAACTTGAA | 137 | 57 |
表2 养殖密度对银鲳幼鱼体生长的影响Tab. 2 Effect of density on the growth of juvenile Pampus argenteus |
组别 | 初始体质量/g | 终末体质量/g | 增重率/% | 特定生长率/% |
---|---|---|---|---|
低密度组(30尾·m-3) | 4.30±0.50 | 11.27±0.46 | 162.02±10.80 b | 3.21±0.14 b |
中密度组(60尾·m-3) | 3.60±0.30 | 12.07±0.37 | 235.19±10.23 a | 4.03±0.10 a |
高密度组(90尾·m-3) | 3.75±0.45 | 11.10±0.91 | 196.00±24.25 ab | 3.61±0.27 ab |
注: 不同小写字母表示该指标在不同密度组中差异显著(p<0.05) |
图1 养殖密度对银鲳幼鱼肝脏谷草转氨酶(a)、谷丙转氨酶(b)、乳酸脱氢酶(c)活力的影响*表示同一密度组与前一时间点比较有显著差异(p<0.05); 不同小写字母表示不同密度组在同一时间点差异显著(p<0.05) Fig. 1 Effect of density on liver AST (a), ALT (b) and LDH (c) activity of juvenile Pampus argenteus. * indicates significant difference between different treatment times at the same density (p<0.05), Different small letters above the bars indicate significant differences between different densities at the same time (p<0.05) |
图2 养殖密度对银鲳幼鱼肾脏谷草转氨酶(a)、谷丙转氨酶(b)、乳酸脱氢酶(c)活力的影响*表示同一密度组与前一时间点比较有显著差异(p<0.05); 不同小写字母表示不同密度组在同一时间点差异显著(p<0.05) Fig. 2 Effect of density on kidney AST (a), ALT (b) and LDH (c) activity of juvenile Pampus argenteus. Asterisk (*) indicates significant difference between different treatment times at the same density (p<0.05), Different small letters above the bars indicate significant differences between different densities at the same time (p<0.05) |
图3 高密度组(90尾·m-3)银鲳幼鱼肝脏AST、ALT、LDH 3种酶基因的mRNA表达变化不同小写字母表示该种酶在不同时间点差异显著(p<0.05) Fig. 3 Change of mRNA relative expression on three liver enzymes in high density group of juvenile Pampus argenteus. Different small letters above the bars indicate significant differences between different times at the same enzyme (p<0.05) |
图4 高密度组(90尾·m-3)银鲳幼鱼肾脏AST、ALT、LDH 3种酶基因的mRNA表达变化不同小写字母表示该种酶在不同时间点差异显著(p<0.05) Fig. 4 Change of mRNA relative expression on three kidney enzymes in high density group of juvenile Pampus argenteus. Different small letters above the bars indicate significant differences between different times at the same enzyme (p<0.05). |
图5 不同密度下银鲳幼鱼肝脏AST、ALT、LDH 3种酶基因的mRNA表达差异不同小写字母表示该种酶在不同密度下差异显著(p<0.05) Fig. 5 Difference of mRNA relative expression on three liver enzymes between different density stresses of juvenile Pampus argenteus. Different small letters above the bars indicates significant differences between different densities at the same enzyme (p<0.05) |
图6 不同密度下银鲳幼鱼肾脏AST、ALT、LDH 3种酶基因的mRNA表达差异不同小写字母表示该种酶在不同密度组差异显著(p<0.05) Fig. 6 Difference of mRNA relative expression on three kidney enzymes between different density stresses of juvenile Pampus argenteus. Different small letters above the bars indicate significant differences between different densities at the same enzyme (p<0.05) |
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