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Effect of bio-floc on water quality and the production performance of bottom and filter feeder carp fed with different protein levels in a pond polyculture system

文献类型： 外文期刊

作者： Zhao, Zhigang 1 ; Xu, Qiyou 1 ; Luo, Liang 1 ; Qiao, Guo 3 ; Wang, Liansheng 1 ; Li, Jinnan 1 ; Wang, Changan 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Heilongjiang River Fisheries Res Inst, Heilongjiang Prov Key Lab Cold Water Fish Germpla, Harbin 150070, Peoples R China

2.Huzhou Normal Univ, Coll Life Sci, Zhejiang Prov Key Lab Aquat Bioresource Conservat, Huzhou 313000, Peoples R China

3.Yancheng Inst Technol, Sch Marine & Biol Engn, Dept Marine Technol, Yancheng 224051, Peoples R China

关键词： Cyprinus carpio specularis; Bio-floc; Feed protein levels; Growth performance; Water quality; Polyculture

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2021 年 531 卷

页码：

收录情况： SCI

摘要： A 90-day experiment was conducted with the aim of investigating the effect of bio-floc on water quality and the production performance of bottom and filter feeder carp fed with different protein levels in a pond polyculture system. For this purpose, three bioflocs treatments with carbohydrate referred to as 'BFT-24% (24% feed protein)', 'BFT-27% (27% feed protein)' and 'BFT-30% (30% feed protein)' and a control referred to as 'CW-30% (30% feed protein)' without carbohydrate addition were performed in three replicate enclosures (7 m x 7 m x 1.5 m) each. Young bottom feeder mirror carp (Cyprinus carpio specularis) and filter feeder bighead carp (Hypophthalmichthys nobilis) with initial mean individual body weights of 691.34 ( +/- 6.73 g) and 327.13 ( +/- 3.54 g), respectively, were stocked altogether in polyculture at biomass of 800 gm(-2) and 200 gm(-2) in the control and treatment enclosures. There was a significant positive correlation between the bioflocs volumes and water temperatures from 19.3-28.5 degrees C (P < 0.05). The pH values and the concentrations of total ammonia nitrogen (TAN), nitrite nitrogen (NO2-N), nitrate nitrogen (NO3-N), total inorganic nitrogen (TIN) and orthophosphate (PO4-P) in all the treatments of BFT were significantly lower than those in the control (P < 0.05), while the total alkalinity, the concentration of chlorophyll a and the chemical oxygen demand (COD) did not show significant differences among the treatments and the control (P < 0.05), while the digestive enzyme activity in the BFT treatments did not show significant differences compared with that in the control (P > 0.05). This study demonstrated that a protein-restricted diet did not affect the productive performance or body condition index of mirror carp and bighead carp in a BFT polyculture system with improved water quality.

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