Influence of stocking density on growth, body composition and energy budget of Atlantic salmon Salmo salar L. in recirculating aquaculture systems

• Published in: Chinese journal of oceanology and limnology Vol. 32; no. 5; pp. 982 - 990
• Main Author: 刘宝良 刘鹰 刘子毅 仇登高 孙国祥 李贤
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer-Verlag 01.09.2014; Science Press; Springer Nature B.V
• Subjects: Aquaculture; Aquaculture techniques; Biology; Body composition; Composition; Conversion ratio; Density; Digestibility; Earth and Environmental Science; Earth Sciences; Energy budget; energy expenditure; Energy metabolism; Energy utilization; Excretion; feces; Feed conversion; Fish; Food conversion; Freshwater fishes; growth performance; Growth rate; High density; industry; Lipids; Marine; Marine fishes; Metabolic rate; Metabolism; Oceanography; Physical growth; Polyculture (aquaculture); Population density; rearing; Recirculating aquaculture systems; Salmo salar; Salmon; specific growth rate; Stocking; Stocking density; stocking rate; 体成分; 大西洋鲑鱼; 循环水养殖系统; 放养密度; 特定生长率; 经济增长; 能量收支; 表观消化率; body composition; Atlantic salmon; growth; energy budget; stocking density; recirculating aquaculture system
• ISSN: 0254-4059; 2096-5508; 1993-5005; 2523-3521
• DOI: 10.1007/s00343-014-3195-2

Atlantic salmon Salmo salar were reared at four stocking densities--high density D1 （final density -39 kg/m^3）, medium densities DE （-29 kg/m^3） and D3 （~19 kg/m^3）, and low density D4 （-12 kg/m^3）- for 40 days to investigate the effect of stocking density on their growth performance, body composition and energy budgets. Stocking density did not significantly affect specific growth rate in terms of weight （SGRw） but did affect specific growth rate in terms of energy （SGRe）. Stocking density significantly influenced the ration level （RLw and RLe）, feed conversion ratio （FCRw and FCRe） and apparent digestibility rate （ADR）. Ration level and FCRw tended to increase with increasing density. Fish at the highest density D~ and lowest density D4 showed lower FCRe and higher ADR than at medium densities. Stocking density significantly affected protein and energy contents of the body but did not affect its moisture, lipid, or ash contents. The expenditure of energy for metabolism in the low-density and high-density groups was lower than that in the medium-density groups. Stocking density affected energy utilization from the feces but had no effect on excretion rate. The greater energy allocation to growth at high density and low density may be attributed to reduced metabolic rate and increased apparent digestibility rate. These findings provide information that will assist selection of suitable stocking densities in the Atlantic-salmon-farming industry.