生物絮团技术对室内培育小规格罗非鱼种的影响

Effect of biofloc technology(BFT) on tilapia fingerlings indoor cultivation

本试验以罗非鱼鱼种[体质量(15.1±0.80)g]为对象,在罗非鱼养殖废水中添加合适的C:N,培养生物絮团,饲养罗非鱼鱼种,研究生物絮团对罗非鱼鱼种养殖效果。采用生物絮团的养殖系统培育罗非鱼鱼种,以不使用生物絮团系统的饲喂组为对照,56 d后,探讨生物絮团对罗非鱼鱼种生长性能、肌肉营养成分及水质的影响。结果显示:1生物絮团组罗非鱼鱼种增重率和特定生长率显著高于对照组(P<0.05)。2生物絮团组罗非鱼鱼种肌肉中粗蛋白含量显著高于对照组(P<0.05),粗脂肪含量相反(P<0.05),两组间水分和灰分无显著性差异(P>0.05)。3生物絮团可显著降低养殖水体氨氮含量(P<0.05),试验结束时生物絮团组水体中的氨氮含量比试验前含量下降了35.8%,对照组上升了44.7%。生物絮团完全可以作为一种蛋白饵料被罗非鱼鱼种摄食利用,提高生长性能,对实现养殖水体的重复利用具有重要意义。

The paper focused on the tilapia fingerlings [（weight：（15.1± 0.80）g],by added the appropriate C∶N in tilapia aquaculture wastewater to obtain bio-floc for tilapia fingerlings,in order to evaluated the effect of bio-floc on tilapia fingerlings culture. The tilapia fingerlings was cultured in the presence of bio-floc with feed supply（bio-floc group）,culture in workshop disinfection of water with feed supply（control group）. After 56 days,the influence of bio-floc on tilapia fingerlings growth performance included muscle nutrition composition,and water quality was studied. The results showed：（1）Weight gain rate（WGR） and specific growth rate（SGR）were significantly higher in floc group,than in the Control group（P 〈0.05）.（2）Proximate composition in whole body of tilapia fingerlings,crude protein content of floc group was significantly higher than that in the control group（P〈0.05）,there were no significant difference in the moisture and ash of all groups（P〉0.05）.（3）Bio-floc could significantly reduce the ammonia nitrogen content in culture water（P〈0.05）,at the end of the experiment,the ammonia nitrogen content in bio-floc group was decreased by 35.8% than before,but the control group increased by 44.7%. Results above indicated that bio-floc rearing media provided a potential food source for tilapia fingerlings reared,and promoted growth performance,and had a great significance to realize aquaculture water recycling.