Fish stocking density impacts tank hydrodynamics

• Published in: Aquaculture
• Main Authors: Rasmussen, Michael R., Lunger, Angela, Laursen, Jesper, McLean, Ewen
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2006
• Subjects: Red drum; Hydrodynamics; Hydraulic residence time; Rhodamine; Dispersion number; Sciaenops ocellatus
• Online Access: https://vbn.aau.dk/da/publications/c2002040-d13d-11db-b8b8-000ea68e967b; https://doi.org/10.1016/j.aquaculture.2005.10.023

The effect of stocking density upon the hydrodynamics of a circular tank, configured in a recirculation system, was investigated. Red drums Sciaenops ocellatus of approximately 140 g wet weight, were stocked at five rates varying from 0 to 12 kg m-3. The impact of the presence of fish upon tank hydrodynamics was established using in-tank-based Rhodamine WT fluorometry at a flow rate of 0.23 l s-1 (tank exchange rate of 1.9 h-1). With increasing numbers of animals, curvilinear relationships were observed for dispersion coefficients and tank mixing times. Stocking densities of 3, 6, 9 and 12 kg m-3 resulted in a 0.2-, 0.5-, 2.4-, and 3.2-fold decrease in mixing time relative to that observed for empty tanks (Pb0.001). Udgivelsesdato: APR 28 The effect of stocking density upon the hydrodynamics of a circular tank, configured in a recirculation system, was investigated. Red drums Sciaenops ocellatus of approximately 140 g wet weight, were stocked at five rates varying from 0 to 12 kg m-3. The impact of the presence of fish upon tank hydrodynamics was established using in-tank-based Rhodamine WT fluorometry at a flow rate of 0.23 l s-1 (tank exchange rate of 1.9 h-1). With increasing numbers of animals, curvilinear relationships were observed for dispersion coefficients and tank mixing times. Stocking densities of 3, 6, 9 and 12 kg m-3 resulted in a 0.2-, 0.5-, 2.4-, and 3.2-fold decrease in mixing time relative to that observed for empty tanks (Pb0.001).