Analysis of Growth Characteristics of Largemouth Bass Micropterus salmoides in a Recirculating Aquaculture System (RAS)
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摘要: 在水温17.3~28.0℃下，将体质量（4.60±0.30）g的大口黑鲈饲养在4口60 m3工厂化循环水养殖池中，放养密度67尾/m3，投喂大口黑鲈专用浮性颗粒配合饲料，研究大口黑鲈在工厂化循环水养殖条件下的生长规律。试验结果显示，养殖195 d后，大口黑鲈平均体质量为（303.14±73.17）g、平均体长为（26.76±3.13）cm；体质量（m）与日龄（t）间呈指数关系：m=0.0651t1.6147，r2=0.9974，平均体质量特定生长率为0.46%，平均体质量日增加量为（1.82±0.57）g；体长（L）与日龄间呈线性关系：L=0.0961t+9.1442，r2=0.9766，平均体长特定生长率为0.15%，平均体长日增长量为（0.10±0.04）cm；体质量与体长符合幂函数：m=0.0132L3.0455，r2=0.9828。在工厂化循环水养殖条件下大口黑鲈的相对增加量、特定生长率趋势基本一致，水温20℃以下明显影响其生长。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℃. The findings indicated that largemouth bass was suitable for aquaculture in RAS, with good growth rate and development prospects.
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