| Agricultural sciences |
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| Effect of feeding frequency on growth , feed utilization and nitrogen and phosphorus waste output of malabar grouper , Epinephelus malabaricus , reared in net pens . |
| JI Wen-xiu,WANG Yan,LI Po-yu |
| College of Animal Sciences , Zhejiang University , Hangzhou 310029 , China |
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Abstract A net pen experiment was carried out to evaluate the effect of feeding frequency on growth ,feed utilization and nitrogen and phosphorus waste output of malabar grouper , Ep inephelus malabaricus . In the experiment , fish [initial body mass ( １３７ ± １) g] were fed raw fish feed at ５ feeding frequencies , including ４ meals per day (４.００ meal.d-１ ) , ２ meals per day (２.００ meal.d-１ ) , １ meal per day (１.００ meal.d-１ ) , １ meal every ２ days (０.５０ meal.d-１) or １ meal every ４ days (０.２５ meal.d-１ ) . The results indicated that feed intake ( FI) , mass gain , feed conversion ratio ( FCR) , nitrogen waste output ( TNW) and phosphorus waste output ( TPW) increased , while nitrogen retention efficiency (NRE) and phosphorus retention efficiency (PRE) decreased with the increase of feeding frequency from ０.２５ meal.d-１ to １.００ meal.d-１. However , no significant changes were found in FI , mass gain , FCR ,NRE , PRE , TNW and TPW ,when feeding frequency was further increased from １.００ meal.d-１ to ４.００meal.d-１ . There were no significant differences in condition factor , hepatosomatic index and whole body composition among fish fed at different feeding frequencies . The results revealed that the suitable feeding frequency for malabar grouper fed raw fish feed should be at １.００ meal.d-１ . Fed at １.００ meal.d-１ for １０９ days , mass gain of malabar grouper was ２５３ g , and FCR was １.１ , and NRE was ２２％ , and PRE was ２４％ , and TNW was １０８ g N.kg -1 fish production , and TPW was ２４ g P.kg -1 fish production .
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Published: 20 July 2011
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不同投喂频率对网箱养殖点带石斑鱼生长、食物利用及氮磷排放的影响
通过网箱养殖实验研究不同投喂频率对初始体质量为(１３７ ± １) g 的点带石斑鱼生长,食物利用及饲料氮、磷排放的影响;实验分别按每天４ 次(４.００ meal.d-１ ) 、每天２ 次(2.00 meal.d-１) 、每天１次(１.００ meal.d-１ ) 、２ 天１ 次(０.５０ meal.d-１ )和４ 天１ 次(０.２５ meal.d-１ )的频率投喂冰鲜杂鱼.结果表明:将投喂频率从０.２５ meal.d-１增加到１.００ meal.d-１ ,鱼摄食率,增质量,饲料系数和饲料氮、磷排放量升高,但饲料氮、磷储积效率下降;将投喂频率从１.００ meal.d-１增加到４.００ meal.d-１ ,鱼摄食率,增质量,饲料氮、磷储积效率和排放量无显著变化;改变投喂频率对条件系数、肝质量指数和鱼体组成无显著影响;本试验结果显示投喂杂鱼饲养点带石斑鱼适宜的投喂频率为１.００ meal.d-１ ,在此投喂频率下,经过１０９ d 生长后增质量可达２５３ g , 饲料系数为１.１ ,饲料氮、磷储积效率分别为２２％ 和２４％ ,每kg 鱼产量饲料氮、磷废物排放量分别为１０８ g 和２４ g .
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