长江流域资源与环境 >> 2014, Vol. 23 >> Issue (s): 112-.doi: 10.11870/cjlyzyyhj2014Z1016

• 生态环境 • 上一篇    下一篇

水体盐度对鲻鱼(Mugil cephalus)幼鱼摄食、生长及肌肉成分的影响

吴庆元 ,蒋 玫 ,李 磊 ,牛俊翔 ,沈新强   

  1. (1.中国水产科学研究院东海水产研究所,上海 200090; 2.上海海洋大学海洋科学学院,上海 201306)
  • 出版日期:2014-11-26

EFFECTS OF SALINITY STRESS ON FEEDING, GROWTH AND BIOCHEMICAL COMPOSITION OF JUVENILE MULLET (MUGIL CEPHALUS

WU Qingyuan1, 2, JIANG Mei1, LI Lei1, NIU Junxiang1,2, SHEN Xinqiang1   

  1. (1.East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China;2.College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
  • Online:2014-11-26

摘要:

将驯化后的鲻鱼(Mugil cephalus)幼鱼分别放在盐度为20、15、10、5、0的条件下饲养20 d,测定鲻鱼幼鱼在不同盐度下,不同时间段(0 d、5 d、10 d、15 d、20 d)其摄食率、体质量(体长)特定生长率及肌肉RNA/DNA和生化成分的变化情况。结果表明:实验初期低盐度胁迫对鲻鱼幼鱼摄食、生长产生了一定抑制作用,与对照组相比,鲻鱼幼鱼的生长具有明显的滞后性(P<0.05);实验后期,各实验组摄食率、体质量(体长)特定生长率及肌肉RNA/DNA较第0 d有明显的提升(P<0.05)。低盐度胁迫对鲻鱼幼鱼肌肉中水分、粗蛋白、粗脂肪及灰分含量影响显著(P<0.05)。在鲻鱼幼鱼肌肉水分随盐度的降低而升高,而粗蛋白、粗脂肪及灰分则随盐度的降低而降低

Abstract:

In order to know the effects of salinity chronic stress on feeding, growth and biochemical composition of juvenile mullet (Mugil cephalus), the tame mullet juveniles (Mugil cephalus) were cultured at water salinity 20, 15, 10, 5 and 0 for 20 d, respectively, with feeding rate, special growth rate (SGR) in body weight and body length, RNA/DNA value and the biochemical composition of muscle determined on the 0th d, 5th d, 10th d, 15th d and 20th d. To facilitate the presentation, S20 was used to stand for the experiment group with the salinity 20, the same as S15, S10, S5, S0. The results revealed that the feeding rates were highly salinitydependent (P < 005) at the beginning of the experiment. Low salinity had an obvious inhibitory effect on the feeding rates of juvenile mullets. Compared with the beginning, the feeding rates had a great advance at the end of the experiment (20th d). The feeding rates of juvenile mullets in S0, S5 were increased from 567%, 579% to 1290%, 1299%. The SGR in body weight and body length were also sensitive to the changes of salinity of water. At the beginning of this experiment, the SGR in body weight and body length were quite different among different salinity groups. The SGR in higher groups such as S20, S15 were higher than in lower groups (S5, S0) (P<005). The SGR of juvenile mullets under the same salinity increased as the experiment went on. The gap between various salinity groups also gradually became narrow. At the end of the experiment, the SGR in lower salinity groups became very close to the higher salinity groups (P>005). The test results of RNA/DNA value also revealed that at first the juvenile mullets grew better when they lived in high salinity water, and then the gap became smaller among these experimental groups, which were consistent with the above rules. The biochemical composition of juvenile mullets was significantly affected by low salinity stress (P <005). The testing results of juvenile mullets muscle showed that the mullets body had a highly content of moisture which accounted for about 75% of the body weight. And the fat and protein contents were occupied about 9% and 6%, respectively. The ash content was the lowest in mullets muscle. The content of moisture in muscle increased with decreased salinity (P<005). At first, the water content in mullets muscle in lower salinity environment was higher than in higher salinity environment, with a ratio of 73% in S0 while 70% in S20. The ratios of moisture became bigger with the experiment, and the ratio in S0 even reached 78% at the end of the experiment. Though the salinity, too, had noticeable impact on the ratios of fat, protein and ash in mullets muscle (P<0.05), the change regulation of fat, protein and ash were quite different with the variation of moisture. The ratios that fat, protein and ash occupied in body weight of juvenile mullets increased with the decreased salinity and the increased test time.

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