| 摘要: |
| 设计盐度为5,10,15,20,25的5个水平，饲养平均体质量为21.91 g±0.23 g的点带石斑鱼(Epinephlus coioides)56 d，研究盐度对点带石斑鱼生长、肌肉成分和消化率的影响。结果表明，不同盐度对点带石斑鱼生长有显著影响（P<0.05），盐度为15～20时，点带石斑鱼增质量率、蛋白质效率较高，饲料系数较低；盐度为5时点带石斑鱼增质量率、蛋白质效率最低，饲料系数最高。不同盐度的各组之间点带石斑鱼肌肉水分、粗蛋白、粗脂肪含量差异不显著（P>0.05）。不同盐度对点带石斑鱼内脏比、丰满度有显著影响，盐度为15,20时，点带石斑鱼内脏比值较小、丰满度值较大，与其他各组差异显著（P<0.05）。随着盐度的增加（5～20），点带石斑鱼干物质消化率与蛋白质消化率有上升趋势，但是盐度增加到25时，消化率下降。实验证明，点带石斑鱼的最适生长盐度为15～20。 |
| 关键词: 点带石斑鱼(Epinephlus coioides) 盐度 生长 肌肉成分 消化率 |
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| 基金项目:福建省海洋与渔业局重点科研资助项目（闽海渔业0338） |
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| Effects of salinity on the growth, muscle composition and digestibility of Epinephlus coioides |
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| Abstract: |
| The effects of variable salinities on the growth, muscle composition and digestibility of grouper (Epinephlus coioides) have been studied. The growth of grouper had been greatly influenced by the salinity （P<0.05). Groupers(body weight, 21.91 g±0.23 g) were reared for 56d with five salinities 5,10,15,20, and 25. The results indicated that different salinities had significant effects on the growth of groupers. At the salinities of 15～20 groupers had the higher weight gain and protein efficiency ratio and the lower feed coefficient. While at the salinity of 5, they had lowest weight gain and protein efficiency ratio and the highest feed coefficient. The salinities had no effects on the water content, crude protein and fat of muscle (P>0.05). However, salinities have great effects on visceral ratio, condition factor. Groupers had the smaller visceral ratio, bigger condition factor at the salinities of 15 and 20,the two groups had significant differences from other (P<0.05).Dry matter digestibility and protein digestibility increased with the salinity increase from 5 to 20,but they declined when salinity was up to 25. The results suggested that the optimum salinities for the growth of grouper were 15～20. |
| Key words: Epinephlus coioides salinity growth muscle composition digestibility |
