生物絮团技术对彭泽鲫生长及养殖水质的影响

Effects of bioflocs technology(BFT) on growth and water quality of crucian carp(Carassius auratus var. pengze)

【目的】研究生物絮团技术对彭泽鲫生长及养殖水质的影响,为生物絮团技术在鲫鱼养殖中的应用提供理论依据。【方法】分别设生物絮团组和对照组,生物絮团组通过添加葡萄糖控制碳氮比(C/N)为20∶1,对照组仅投喂配合饲料。试验周期60 d,期间每隔6 d测定一次水质指标(氨氮、亚硝酸盐氮、硝酸盐氮),试验结束后测定彭泽鲫的生长指标。【结果】生物絮团组彭泽鲫的终末均重、个体增重率、特定生长率、饵料蛋白利用率均显著高于对照组(P<0.05,下同),饵料系数则显著低于对照组。在养殖水质方面,从整个养殖周期来看,生物絮团组的氨氮浓度相对较稳定,维持在1.00 mg/L左右;亚硝酸盐氮浓度变化呈逐渐下降的趋势;硝酸盐氮浓度也比较稳定,基本维持在10.00 mg/L以下。【结论】生物絮团技术应用于彭泽鲫养殖中可有效改善水质,并可促进彭泽鲫生长和提高饵料利用效率,实现饵料蛋白的二次利用。

【Objective】Effects of bioflocs technology（BFT） on growth and water quality of crucian carp were studied to provide theoretical references for BFT application in crucian breeding. 【Method】Carbon nitrogen ratio（C/N） was controlled as 20∶1 in bioflocs by adding glucose, while there was only feed in the control group. A 60-day experiment was conducted to determine growth indicators. Water quality indicators（total ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen） were tested every six days. 【Result】Final mean weight, single weight gain rate, specific growth rate and feed protein additive amount of bioflocs were significantly higher than those of the control group（P〈0.05,the same below）. However feed coefficient was significantly lower than that of the control group. Regarding water quality, ammonia concentration of bioflocs was relatively stable during the whole breeding period（1.00 mg/L）. Nitrite concentration was decreasing, while nitrate nitrogen concentration was relatively stable（10.00 mg/L）. 【Conclusion】BFT could improve water quality in crucian carp culture systems, enhance crucian carp growth and feed efficiency, and realize reutilization of feed protein.