Abstract: A 78-days feeding trial of polyculture of marbled eel Anguillamarmorata, tilapia Oreochromisniloticus and water spinach Ipomoeaaquatica was conducted in 12 indoor cement tanks of each 3.0 m×5.0 m×1.2 m by supplement with cassava starch and corn starch using biological floc technology to assess the effect of addition of carbon source on water quality in culture tanks and production performance in marbled eel.Marbled eel juveniles with body weight of 141.5 g were monocultured at a stocking density of 8 individuals/m2 as a control (group A) and polycultured with tilapia with body weight of 74.5 g at a density of 8 individuals/m2 and water spinach water at a biomass of 200 g/m2 without starch supplementation (group B) and with corn starch supplementation (group C) and with cassava starch supplementation (group D).During the experiment the marbled eel were fed commercial feed twice a day with organic carbon sources at a dose of 75% of feed intake by marbled eel, and C/N ratio of 12, without water exchange.The results showed that there were significantly lower concentrations of total nitrogen (TN), total phosphorus (TP), and in water in the polyculture ponds with starch supplementation than those in the control tank (P<0.05) at the end of the experiment.During the experiment, great fluctuation of and levels were observed among various groups, without regular pattern, and the concentration of chlorophyll a was found to be increased first and then decreased with change in water temperature.The COD levels were changed with amount of biofloc which was consistent with the change in total suspended particle levels.The maximal protein content in biofloc was found in group D (23.68%), without significant difference from group C (21.88%) (P>0.05), significantly higher than those in groups A(17.33%) and B(16.89%) (P<0.05 ).There were significantly higher utilization coefficients of nitrogen and phosphorous in group C (31.43% and 14.14%) and group D (28.08% and 13.69%) that those in group A (18.43% and 9.23%) and group B (19.91% and 8.42%).Marbled eel had biomass of 30.51 kg/pond in group C, and 30.09 kg/pond in group D, significantly higher than the fish in group A (26.43 kg/pond) and group B (27.45 kg/pond) did (P<0.05), with the similar case in average body weight(225.86 g and 234.62 g), specific growth rate (0.60%/d and 0.62%/d), and weight gain rate (55.63% and 61.67%).There was lower food conversion ratio in group C(1.87), and group D(1.57) were than A(2.32), without significantly difference groups C and D (P>0.05).The findings indicate that supplementation with organic carbon source in system of marbled eel, tilapia and water spinach improves water quality and biomass of aquatic organisms.
唐肖峰, 刘利平, 帅滇, 张利娜. 碳源对花鳗鲡养殖系统水质及生产性能的影响[J]. 大连海洋大学学报, 2019, 34(1): 70-79.
TANG Xiao-feng, LIU Li-ping, SHUAI Dian, ZHANG Li-na. Effects of addition of carbon sources on water quality in farming tanks and production performance in marbled eel Anguilla marmorata. Journal of Dalian Ocean University, 2019, 34(1): 70-79.
2019, Vol. 34 
