Effects of Different Feeding Rates on Growth, Water Quality and Microbial Community Metabolic Diversity of Cultured Tilapia

doi:10.11924/j.issn.1000-6850.casb2021-0069

Abstract

Abstract:

To study the effects of different feeding rates on the growth, water physicochemical indexes and microbial community metabolic diversity of cultured tilapia, 16±0.20 g Oreochromis niloticus was used as the research object, the effects of different feed rates on tilapia growth and water quality indicators were explored. Biolog-ECO method was used to detect the utilization of 31 carbon sources by microorganisms in culture water samples, to study the differences of microbial metabolic diversity under different feeding rates. The results showed that the tilapia with 4% feeding rate had the lowest feed coefficient and relatively high feed utilization rate; high feeding rate had a relatively great impact on water quality, and different feeding rates had an impact on microbial metabolic diversity in aquaculture water; the Shannon index of 4% feeding rate was relatively high, and there were more kinds of microorganisms in water; Pearson correlation analysis showed that COD, TN, TP, NH₃-N had strong positive correlations (P<0.05) with water microbial metabolic diversity metabolism of β-methyl-D-glucoside, glucose-1-phosphate, glycyl-L-glutamic acid. In the process of tilapia culture, considering both ecological and economic benefits, we should feed the tilapia with proper feeding rates, the feeding rate with the initial tilapia size of about 16g is around 4%.

Key words: different feeding rates, tilapia, growth effect, water physicochemical indexes, microbial community metabolic diversity

CLC Number:

S963.14

Dong Xinxu, Fan Limin, Song Chao, Zheng Yao, Qiu Liping, Meng Shunlong, Chen Jiazhang. Effects of Different Feeding Rates on Growth, Water Quality and Microbial Community Metabolic Diversity of Cultured Tilapia[J]. Chinese Agricultural Science Bulletin, 2021, 37(27): 146-154.

Figures/Tables 7

References 33

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处理	饲料消耗量/g	增重量/g	饵料系数	平均体长/cm
1%	312	223.98±42.66^e	1.393^a	9.0853±0.0729^e
2%	624	500.43±43.91^d	1.247^a	9.9517±0.0652^d
4%	1183	950.31±71.93^c	1.245^a	10.7715±0.1617^c
6%	1872	1442.24±15.19^b	1.298^a	11.8967±0.1877^b
8%	2496	1778.17±57.26^a	1.404^a	12.5133±0.1364^a

处理	饲料消耗量/g	增重量/g	饵料系数	平均体长/cm
1%	312	223.98±42.66^e	1.393^a	9.0853±0.0729^e
2%	624	500.43±43.91^d	1.247^a	9.9517±0.0652^d
4%	1183	950.31±71.93^c	1.245^a	10.7715±0.1617^c
6%	1872	1442.24±15.19^b	1.298^a	11.8967±0.1877^b
8%	2496	1778.17±57.26^a	1.404^a	12.5133±0.1364^a