鱼菜共生系统下种养密度和投喂频率对鲫鱼生长及品质的影响

为评估不同种养密度和投喂频率对鱼菜共生系统中鲫鱼生长及品质的影响,建立温室基质栽培式鱼菜共生系统(鲫鱼+生菜),设置种植密度分别为28(A1)、42(A2)、56(A3)株·m-2;养殖密度分别为8(B1)、10(B2)、12(B3)kg·m-3;饲料投喂频率分别为1(C1)、2(C2)、3(C3)次·d-1,以明确鱼...

Effects of Planting Density and Feeding Frequency on Growth and Quality of Crucian Carp under Aquaponics System

In order to evaluate the effects of planting densities and feeding frequencies on the growth and quality of crucian carp in the aquaponics system， an experimental aquaponics system （crucian carp+lettuce） based on substrate cultivation was set up in the greenhouse. The planting densities of lettuce were 28 （A1）， 42 （A2） and 56 （A3） plants·m^-2， the breeding densities of crucian carp were 8 （B1）， 10 （B2） and 12（B3）kg·m^-3 with the feeding frequency of 1 （C1）， 2 （C2）， 3（C3）meal·d^-1. The growth and quality of crucian carp were determined for clarifying the optimal combination of planting density and feeding frequency under the aquaponics system. The results showed that the quality of water in each treatment was stable during the test period， and the growth indexes of crucian carp increased. The feeding density had significant effects on the weight gain rate， specific growth rate and feed coefficient of crucian carp， and A2B1C2 treatment was the best. The planting density and feeding frequency had significant effect on weight gain and protein efficiency， and A1B3C3 treatment was the highest with weight gain 303.56 g and protein efficiency 3.87， respectively. The water content of crucian carp was the highest when feeding frequency was 2 meal·d^-1. There were no significant effects on fatness， crude protein， crude fat and other muscle components of crucian carp. In conclusion， the growth performance and quality of the crucian carp were optimal with planting density 42 plants·m^-2， breeding density 8 kg·m^-3 and feeding frequency 2 meal·d^-1.