Flow Fields Inside Stocked Fish Cages and the Near Environment
This study explores the average flow field inside and around stocked Atlantic salmon (Salmo salar L.) fish cages. Laboratory tests and field measurements were conducted to study flow patterns around and through fish cages and the effect of fish on the water flow. Currents were measured around an emp...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.1053.5931 2023-05-15T15:32:11+02:00 Flow Fields Inside Stocked Fish Cages and the Near Environment Lars C Gansel Siri Rackebrandt Frode Oppedal Thomas A Mcclimans The Pennsylvania State University CiteSeerX Archives 2014 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1053.5931 http://offshoremechanics.asmedigitalcollection.asme.org/data/Journals/JMOEEX/929978/omae_136_03_031201.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1053.5931 http://offshoremechanics.asmedigitalcollection.asme.org/data/Journals/JMOEEX/929978/omae_136_03_031201.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://offshoremechanics.asmedigitalcollection.asme.org/data/Journals/JMOEEX/929978/omae_136_03_031201.pdf text 2014 ftciteseerx 2020-04-12T00:18:30Z This study explores the average flow field inside and around stocked Atlantic salmon (Salmo salar L.) fish cages. Laboratory tests and field measurements were conducted to study flow patterns around and through fish cages and the effect of fish on the water flow. Currents were measured around an empty and a stocked fish cage in a fjord to verify the results obtained from laboratory tests without fish and to study the effects of fish swimming in the cage. Fluorescein, a nontoxic, fluorescent dye, was released inside a stocked fish cage for visualization of three-dimensional flow patterns inside the cage. Atlantic salmon tend to form a torus shaped school and swim in a circular path, following the net during the daytime. Current measurements around an empty and a stocked fish cage show a strong influence of fish swimming in this circular pattern: while most of the oncoming water mass passes through the empty cage, significantly more water is pushed around the stocked fish cage. Dye experiments show that surface water inside stocked fish cages converges toward the center, where it sinks and spreads out of the cage at the depth of maximum biomass. In order to achieve a circular motion, fish must accelerate toward the center of the cage. This inward-directed force must be balanced by an outward force that pushes the water out of the cage, resulting in a low pressure area in the center of the rotational motion of the fish. Thus, water is pulled from above and below the fish swimming depth. Laboratory tests with empty cages agree well with field measurements around empty fish cages, and give a good starting point for further laboratory tests including the effect of fish-induced currents inside the cage to document the details of the flow patterns inside and adjacent to stocked fish cages. The results of such experiments can be used as benchmarks for numerical models to simulate the water flow in and around net pens, and model the oxygen supply and the spreading of wastes in the near wake of stocked fish farms. Text Atlantic salmon Salmo salar Unknown |
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This study explores the average flow field inside and around stocked Atlantic salmon (Salmo salar L.) fish cages. Laboratory tests and field measurements were conducted to study flow patterns around and through fish cages and the effect of fish on the water flow. Currents were measured around an empty and a stocked fish cage in a fjord to verify the results obtained from laboratory tests without fish and to study the effects of fish swimming in the cage. Fluorescein, a nontoxic, fluorescent dye, was released inside a stocked fish cage for visualization of three-dimensional flow patterns inside the cage. Atlantic salmon tend to form a torus shaped school and swim in a circular path, following the net during the daytime. Current measurements around an empty and a stocked fish cage show a strong influence of fish swimming in this circular pattern: while most of the oncoming water mass passes through the empty cage, significantly more water is pushed around the stocked fish cage. Dye experiments show that surface water inside stocked fish cages converges toward the center, where it sinks and spreads out of the cage at the depth of maximum biomass. In order to achieve a circular motion, fish must accelerate toward the center of the cage. This inward-directed force must be balanced by an outward force that pushes the water out of the cage, resulting in a low pressure area in the center of the rotational motion of the fish. Thus, water is pulled from above and below the fish swimming depth. Laboratory tests with empty cages agree well with field measurements around empty fish cages, and give a good starting point for further laboratory tests including the effect of fish-induced currents inside the cage to document the details of the flow patterns inside and adjacent to stocked fish cages. The results of such experiments can be used as benchmarks for numerical models to simulate the water flow in and around net pens, and model the oxygen supply and the spreading of wastes in the near wake of stocked fish farms. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Lars C Gansel Siri Rackebrandt Frode Oppedal Thomas A Mcclimans |
spellingShingle |
Lars C Gansel Siri Rackebrandt Frode Oppedal Thomas A Mcclimans Flow Fields Inside Stocked Fish Cages and the Near Environment |
author_facet |
Lars C Gansel Siri Rackebrandt Frode Oppedal Thomas A Mcclimans |
author_sort |
Lars C Gansel |
title |
Flow Fields Inside Stocked Fish Cages and the Near Environment |
title_short |
Flow Fields Inside Stocked Fish Cages and the Near Environment |
title_full |
Flow Fields Inside Stocked Fish Cages and the Near Environment |
title_fullStr |
Flow Fields Inside Stocked Fish Cages and the Near Environment |
title_full_unstemmed |
Flow Fields Inside Stocked Fish Cages and the Near Environment |
title_sort |
flow fields inside stocked fish cages and the near environment |
publishDate |
2014 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1053.5931 http://offshoremechanics.asmedigitalcollection.asme.org/data/Journals/JMOEEX/929978/omae_136_03_031201.pdf |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
http://offshoremechanics.asmedigitalcollection.asme.org/data/Journals/JMOEEX/929978/omae_136_03_031201.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1053.5931 http://offshoremechanics.asmedigitalcollection.asme.org/data/Journals/JMOEEX/929978/omae_136_03_031201.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766362687316426752 |