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Analysis of Growth Characteristics of Largemouth Bass Micropterus salmoides in a Recirculating Aquaculture System (RAS |
HAN Xiaolei1, WANG Hao1, GAO Junjie1, SUN Yuxiang1, ZHANG Yaowen2, GU Xiaoding2, XU Jianrong1 |
1. Changshu Institute of Technology, Changshu 215500, China; 2. Changshu Yuntian Agricultural Technology Co, Ltd, Changshu 215500, China |
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Abstract Largemouth bass Micropterus salmoides with body weight of (4.6±0.30) g was raised in four 60 m3 ponds with recirculating water at stocking density of 67 individuals/m3, and fed special floating formulated diet for 195 d at water temperature of 17.3—28.0 ℃ to explore the growth characteristics of largemouth bass in a recirculating aquaculture system (RAS). The cultured largemouth bass had average body weight of (303.14±73.17) g and average body length of (26.76±3.13) cm in the RAS. The relationship between body weight and age was expressed as exponential equation as m=0.0651t1.6147, r2=0.9974, with average specific growth rate of 0.46% in body weight, and the average daily body weight gain of (1.82±0.57) g. The linear relationship between body length and age was described as L=0.0961t+9.1442, r2=0.9766, with average instantaneous growth rate of 0.15% in body length, and the average body length growth of (0.10±0.04) cm. The relationship between body weight and body length was in accordance with the power function at m=0.0132L3.0455, r2=0.9828. In RAS, the largemouth bass had basically the same relative weight gain and specific growth rate, and significantly lower growth at water temperature of below 20 °C. The findings indicated that largemouth bass was suitable for aquaculture in RAS, with good growth rate and development prospects.
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Received: 08 September 2019
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