使用生态基对室内养殖系统中杂交太阳鱼生长及养殖水环境的影响

摘要

In the present paper,we studied the effects of the different densities of ecological substrates on the growth and water quality of the hybrid sunfish(Lepomis macrochius ♀×Lepomis cyanellus ♂)cultured in indoor system,which was produced by the hybridization between the two sunfish introduced from North American.In the present experiment,we set up a total of 0.049,0.098,0.197,0.295 and 0.393 m2/m3 in five different ecological substrates density gradient used in the sunfish culture system,and a group of none ecological substrates used as the control group,each group set 3 repetitions,a total of 18 aquaculture barrels used in the experiment.We used nanometer bottom aerator to increase oxygen during the experiment,and didn`t exchage the water during the whole culture period,monitored the water dissolved oxygen(DO),pH and water temperature(Wt)every day,monitored the total ammonia(TAN)and nitrite nitrogen(NO-2-N)content of the water every 5 days,and measured the growth index of the cultured sunfish at the beginning and the end of the experiment.The experimental results showed that the use of ecological substrates could effectively promote the growth of hybrid sunfish,reduce the feed coefficient,and improve the quality of aquaculture water,and compared with the control group,the average total ammonia nitrogen concentration could be reduced by 24.15%.Through the regression analysis,it was found that the suitable density of the ecological substrates in the hybrid sunfish culture is no less than 0.244 m2/m3.%以蓝鳃太阳鱼和绿鳃太阳鱼杂交产生的杂交太阳鱼F1代为研究对象,研究了不同生态基的使用量对室内养殖系统中杂交太阳鱼的生长及养殖水质的影响.实验共设置0.049、0.098、0.197、0.295和0.393 m2/m3五种不同生态基使用量梯度,以不使用生态基的养殖桶为对照组,每组设置3个重复,共使用18个养殖桶.实验期间使用纳米圆盘底增氧方式增氧,整个养殖期间不换水,持续对水体溶解氧(DO)、pH和温度(Wt)进行监测,每5天测定水体总氨氮(TAN)和亚硝酸盐氮(NO-2-N)含量,实验开始和结束时分别测定杂交太阳鱼的生长情况.结果表明:使用生态基能有效促进杂交太阳鱼的生长、降低饲料系数,同时改善养殖水体的水质,平均总氨氮浓度与对照组相比可降低24.15%.通过回归分析可知,杂交太阳鱼养殖中生态基的适宜使用量低限为0.244 m2/m3.