翘嘴鲌鱼种对磷的需求量
DIETARY PHOSPHORUS REQUIREMENT OF CULTER ALBURNUS FINGERLING
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摘要: 以磷酸二氢钠为磷源,制成含磷水平为0.53%—1.61%的7种半精制试验饲料,饲养7组三重复的翘嘴隔冬鱼种。试验鱼每尾平均体重3.79±0.20g。饲养期为8周。试验结果表明,饲料磷含量不足会导致鱼体生长不良,饲料效率低下。饲料磷为0.88%或以上时,鱼体增重和饲料效率显著提高。全鱼脂肪含量随饲料磷水平上升而呈下降趋势,但各试验组间无显著差异(p0.05)。全鱼的粗灰分含量与饲料磷水平呈正相关。饲料磷水平为0.88%或更高时,全鱼磷含量和脊椎骨的灰分含量稳定在同一水平上。饲料磷水平对全鱼水分、全鱼粗蛋白、鳞片灰分、鳞片磷和脊椎骨磷含量无显著影响(p0.05)。因此,满足翘嘴鱼种生长所需的饲料磷为0.88%。Abstract: A feeding trial was conducted with water flow-through fiberglass tank systems to evaluate the dietary phosphorus requirement ofCulter alburnus fingerling. Seven sem-ipurified diets containing phosphorus levels ranging from 0.53% to 1.61% were formulated by including graded levels of monobasic sodium phosphate. Test diets were fed to triplicate groups of 30 fingerlings initially weighing 3.79?.20g/fish. Water temperature during the feeding trial was controlled at 27?癈. The fish were hand-fed to approaching satiation three times a day for 8 weeks. The results show that fish fed the two diets with low levels of phosphorus( diet 1 and diet 2) have significantly lower weight gain and feed efficiency(pp> 0.05) between treatments of diet 1 and diet 2 and among treatments of diet 3, diet 4, diet 5, diet 6 and diet 7; the survival rate of fish is not affected by the levels of dietary phosphorus. It was also observed that, at the end of feeding trial, the whole body lipid has a tendency to decrease with the increment of dietary phosphorus levels, even though there is no significant difference among treatments (p> 0.05); the whole body ash is affected significantly(pp> 0.05) among fish groups fed diets of 1 to 4, of 3 to 6 and of 5 to 7, respectively; whole body phosphorus is significantly lower (p> 0.05) when the fish fed two diets with phosphorus levels of less than 0.88%, and reaches to a plateau when the fish fed diets with phosphorus levels of 0.88% and more; vertebrae ash appears to have similar responses to the levels of dietary phosphorus as whole body phosphorus; there is no significant difference (p> 0.05) of whole body moisture, whole body protein, scale ash, scale phosphorus and vertebrae phosphorus among test groups. It can be concluded that the dietary phosphorus requirement for C. alburnus fingerling is approximately 0.88% of dry diet, which was important for this species to maintain the normal growth and vertebrae mineralisation as well as a stable level of whole body phosphorus.
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Keywords:
- Culter alburnus /
- Phosphorus /
- Requirement /
- Weight gain /
- Feed efficiency
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