Effects of different light intensity on plasma biochemical indexes of Euthynnus affinis on sunny and cloudy days
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摘要: 光照是水产养殖中的一个重要环境因子。探究小头鲔 (Euthynnus affinis) 在晴天和阴天对不同光照强度的生理变化,可为研究其最适养殖环境因子调控提供参考。在晴天和阴天分别设置4个取样时间,研究了在晴天光照强度 [2.7 lx (6:00)、1 116 lx (12:00)、913 lx (18:00)、1 lx (24:00)] 和阴天光照强度 [1.9 lx (6:00)、698 lx (12:00)、192 lx (18:00)、1.4 lx (24:00)] 下,小头鲔血浆中皮质醇、总胆固醇、甘油三酯、丙二醛、髓过氧化物酶活性、溶菌酶活性和免疫球蛋白M浓度的变化。结果显示,皮质醇、丙二醛浓度和溶菌酶活性在晴天的4个时间点均无显著性差异,但均在阴天18:00达到最高值,且阴天18:00的皮质醇、丙二醛浓度显著高于晴天18:00 (P<0.05),而溶菌酶活性则显著低于晴天18:00 (P<0.05);总胆固醇浓度分别在晴天12:00和阴天18:00达到最高值,但晴天12:00与阴天12:00无显著性差异,而阴天18:00则显著高于晴天18:00 (P<0.05);甘油三酯浓度、髓过氧化物酶活性在晴天和阴天6:00均达到最高值,但两者无显著性差异。免疫球蛋白M浓度均在晴天和阴天24:00达到最高值,且晴天24:00显著低于阴天24:00 (P<0.05)。结果表明,小头鲔更适宜在晴天的光照下生存,但会通过积极的生理调节以适应不同天气的光照强度变化,从而减少环境因子对其生理及免疫功能的损伤。Abstract: Illumination is an important factor in aquaculture. Exploring the changes in the plasma physiology and biochemistry of Euthynnus affinis can provide references for the regulation of its optimal environmental factors. We designed four sampling time to investigate the light intensities on sunny days [2.7 lx (6:00), 1 116 lx (12:00), 913 lx (18:00) and 1 lx (24:00)] and those on cloudy days [1.9 lx (6: 00), 698 lx (12:00), 192 lx (18:00) and 1.4 lx (24:00)], so as to study the changes in the plasma cortisol, total cholesterol, triglyceride, malondialdehyde content, myeloperoxidase activity, lysozyme activity and immunoglobulin M concentration. The results show that there was no significant difference in the cortisol, malondialdehyde concentration and lysozyme activity among the four groups on sunny days, but they all reached the maximum at 18:00 on cloudy days. Besides, the concentraions of cortisol and malondialdehyde were significantly higher than those at 18:00 on sunny days (P<0.05), while the lysozyme activity was significantly lower (P<0.05). The total cholesterol content reached the maximum at 12:00 on sunny day and 18:00 on cloudy day, with no significant difference on sunny day and cloudy day at 12:00. However, it was significantly higher at 18:00 on cloudy days than on sunny days. The triglyceride content and myeloperoxidase activity reached the maximum on both sunny and cloudy days at 6:00, without significant difference. The immunoglobulin M concentration reached the maximum at 24:00 on both sunny and cloudy days, and it was significantly lower on sunny days than on cloudy days at 24:00 (P<0.05). The results show that the E. affinis is more suitable for surviving on sunny days, but it can adapt to the changes of light intensity in different weather by its active physiological adjustment, thereby reducing the damage of environmental factors to its physiological and immune functions.
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Key words:
- Euthynnus affinis /
- Light intensity /
- Sunny day /
- Cloudy day /
- Biochemical index
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图 1 晴天和阴天中不同光照强度下小头鲔皮质醇、总胆固醇和甘油三酯日变化规律
注:小写英文字母不同者间差异显著(P<0.05),后图同此。
Figure 1. Daily change of concentrations of cortisol, total cholesterol and triglyceride of E. affinis with different light intensities on sunny and cloudy days
Note: Different lowercase letters indicate significant differences (P<0.05). The same case in the following figures.
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