关键词: 生态基, 杂交太阳鱼, 生长, 水质, 适宜使用量, eco-substrates, hybrid sunfish (Lepomis macrochius ♀ × Lepomis cyanellus ♂), growth, water quality, suitable density

Abstract: 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 for 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 change 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 (NO2--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, we can get the suitable density of the ecological substrates in the hybrid sunfish culture is no less than 0.244 m2/m3.