欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
本实验研究日常规换水（1次,总水体的1/3）、循环水和＂生物絮团＂三种凡纳滨对虾Litopenaeus vannamei养殖模式中,水质指标的变化规律及对虾的存活与生长。在水温22~28℃、溶氧6mg/L左右、盐度6.8~8.9条件下,将体长为（2.70±0.15）cm的仔虾分为3组,饲养在6个容积为200L的圆形水槽中,每槽30尾（167尾/m3）,养殖80d。结果表明：3组水中氨氮含量均先升后降,后期稳定,各组氨氮含量的峰值分别为0.68mg/L、0.39mg/L和0.83mg/L;日常规换水组中的亚硝酸盐含量呈波动上升,中期时达到峰值1.63mg/L,而后下降至（0.85±0.03）mg/L左右波动,而循环水和＂生物絮团＂组的亚硝酸盐含量始终稳定在0.1mg/L左右;循环水组中的硝酸盐含量一直在累积上升,至实验结束时达到峰值3.9mg/L,而其他两组水中的硝酸盐含量基本未检出;3组的COD值均呈现波动上升趋势,上升幅度为：＂生物絮团＂组〉日常规换水组〉循环水组,各组峰值分别为13.33mg/L、11.41mg/L和14.41mg/L;养殖过程各组水体p H在7.6~8.6之间,日常规换水组p H维持在8.3左右,其他两组则呈下降趋势,至实验结束时出现最小值,分别为7.6和7.76。日常规换水、循环水和＂生物絮团＂组中对虾的存活率分别为78.33%、91.67%和93.33%,日常规换水组与其他两组差异极显著（P〈0.01）;对虾平均出池体质量分别为（7.23±0.8）g、（7.48±0.2）g和（8.26±0.06）g,＂生物絮团＂组与其他两组差异极显著（P〈0.01）。
英文摘要：
The variations in water quality indices, the survival and growth were studied in juvenile Pacific white leg shrimp Litopenaeus vannamei reared in six circular water tanks of each 200 L at a stocking density of 30 individuals per tank or 167 individuals/m3 in three culture system including daily 1/3 water exchange system, recycling water system and ＂Bio-floc＂system at water temperature of22℃~28℃, dissolved oxygen level（DO）of some 6 mg/L and a salinity of 6.8~8.9 for 80 days. The ammonia levels were found to be first increased and then decreased in three systems, finally stable, with the peak value of 0.68 mg/L in daily 1/3 water exchange system,0.39 mg/L in recycling water system, and 0.83 mg/L in ＂Bio-floc＂system. The nitrite level was found to be first elevated, with the peak of 1.63 mg/L in the mid-experiment in daily 1/3 water exchange system, then to be decreased, and stabilized at about（0.85 ±0.03）mg/L. However, the nitrite level was fluctuated around 0.1 mg/L in the daily 1/3 water exchange system and ＂Bio-floc＂system.The nitrate levels were elevated, with the peak of 3.9 mg/L in the end of the experiment in the daily 1/3 water exchange system, and not detected in the other two systems. The order of the COD levels were descendantly ranged as ＂Bio-floc＂system daily 1/3 water exchange system recycling water system, with peaks of 13.33 mg/L in daily 1/3 water exchange system, 11.41 mg/L in recycling water system and 14.41 mg/L＂Bio-floc＂system. There was p H from 7.6 to 8.6 in the three systems, at about 8.3 in the daily 1/3 water exchange system, the minimum value of 7.6 and 7.76 in the other two systems at the end of the trial. The shrimp had survival rate of78.33% and final body weight of（7.23 ±0.8）g in daily 1/3 water exchange system, survival rate of 91.67% and final body weight of（7.48 ±0.2）g in recycling water system and survival rate of 93.33% and final body weight of（8.26 ±0.06）g in ＂Bio-floc＂system,very significant difference in survival rate between
同期刊论文项目
同项目期刊论文
期刊信息
位置：