The Experts below are selected from a list of 56934 Experts worldwide ranked by ideXlab platform
Frode Oppedal - One of the best experts on this subject based on the ideXlab platform.
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fast Water Currents reduce production performance of post smolt atlantic salmon salmo salar
Aquaculture Environment Interactions, 2015Co-Authors: Frida Solstorm, Anders Ferno, Frode Oppedal, David Solstorm, Thomas W K Fraser, Rolferik OlsenAbstract:In the future, an increasing number of salmon farms may be located in areas with fast Water current velocity due to limited availability of more sheltered locations. However, there is lit- tle information as to how fast Currents affect fish health and welfare. We used raceways to expose Atlantic salmon post-smolts (98.6 g, 22.3 cm) to homogeneous Water velocities corresponding to 0.2, 0.8 and 1.5 body lengths s �1 (slow, moderate and fast, respectively) over 6 wk. Fish at fast velocity had a 5% lower weight gain compared to fish at moderate and slow velocities, with a cor- responding reduction in length. Fish at moderate and fast velocities had lower lipid content in the muscle compared to fish at slow velocity. Hence, fish at slow and moderate velocities had the same weight gain, but fish at slow velocity gained more fat and fish at moderate velocity more muscle protein. Fish at fast velocity had a higher relative ventricular mass, indicating an increased cardiac workload. At slow velocity, individual fish displayed elevated plasma levels of lactate, osmolality and potassium. Our results suggest that post-smolts had the best growth and welfare at moderate velocity and that a current velocity of 1.5 body lengths s �1 could compromise production performance.
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the interaction between Water Currents and salmon swimming behaviour in sea cages
PLOS ONE, 2014Co-Authors: David Johansson, Frida Laursen, Anders Ferno, Jan Erik Fosseidengen, Pascal Klebert, Lars Helge Stien, Tone Vagseth, Frode OppedalAbstract:Positioning of sea cages at sites with high Water current velocities expose the fish to a largely unknown environmental challenge. In this study we observed the swimming behaviour of Atlantic salmon (Salmo salar L.) at a commercial farm with tidal Currents altering between low, moderate and high velocities. At high current velocities the salmon switched from the traditional circular polarized group structure, seen at low and moderate current velocities, to a group structure where all fish kept stations at fixed positions swimming against the current. This type of group behaviour has not been described in sea cages previously. The structural changes could be explained by a preferred swimming speed of salmon spatially restricted in a cage in combination with a behavioural plasticity of the fish.
Rolferik Olsen - One of the best experts on this subject based on the ideXlab platform.
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fast Water Currents reduce production performance of post smolt atlantic salmon salmo salar
Aquaculture Environment Interactions, 2015Co-Authors: Frida Solstorm, Anders Ferno, Frode Oppedal, David Solstorm, Thomas W K Fraser, Rolferik OlsenAbstract:In the future, an increasing number of salmon farms may be located in areas with fast Water current velocity due to limited availability of more sheltered locations. However, there is lit- tle information as to how fast Currents affect fish health and welfare. We used raceways to expose Atlantic salmon post-smolts (98.6 g, 22.3 cm) to homogeneous Water velocities corresponding to 0.2, 0.8 and 1.5 body lengths s �1 (slow, moderate and fast, respectively) over 6 wk. Fish at fast velocity had a 5% lower weight gain compared to fish at moderate and slow velocities, with a cor- responding reduction in length. Fish at moderate and fast velocities had lower lipid content in the muscle compared to fish at slow velocity. Hence, fish at slow and moderate velocities had the same weight gain, but fish at slow velocity gained more fat and fish at moderate velocity more muscle protein. Fish at fast velocity had a higher relative ventricular mass, indicating an increased cardiac workload. At slow velocity, individual fish displayed elevated plasma levels of lactate, osmolality and potassium. Our results suggest that post-smolts had the best growth and welfare at moderate velocity and that a current velocity of 1.5 body lengths s �1 could compromise production performance.
Anders Ferno - One of the best experts on this subject based on the ideXlab platform.
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fast Water Currents reduce production performance of post smolt atlantic salmon salmo salar
Aquaculture Environment Interactions, 2015Co-Authors: Frida Solstorm, Anders Ferno, Frode Oppedal, David Solstorm, Thomas W K Fraser, Rolferik OlsenAbstract:In the future, an increasing number of salmon farms may be located in areas with fast Water current velocity due to limited availability of more sheltered locations. However, there is lit- tle information as to how fast Currents affect fish health and welfare. We used raceways to expose Atlantic salmon post-smolts (98.6 g, 22.3 cm) to homogeneous Water velocities corresponding to 0.2, 0.8 and 1.5 body lengths s �1 (slow, moderate and fast, respectively) over 6 wk. Fish at fast velocity had a 5% lower weight gain compared to fish at moderate and slow velocities, with a cor- responding reduction in length. Fish at moderate and fast velocities had lower lipid content in the muscle compared to fish at slow velocity. Hence, fish at slow and moderate velocities had the same weight gain, but fish at slow velocity gained more fat and fish at moderate velocity more muscle protein. Fish at fast velocity had a higher relative ventricular mass, indicating an increased cardiac workload. At slow velocity, individual fish displayed elevated plasma levels of lactate, osmolality and potassium. Our results suggest that post-smolts had the best growth and welfare at moderate velocity and that a current velocity of 1.5 body lengths s �1 could compromise production performance.
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the interaction between Water Currents and salmon swimming behaviour in sea cages
PLOS ONE, 2014Co-Authors: David Johansson, Frida Laursen, Anders Ferno, Jan Erik Fosseidengen, Pascal Klebert, Lars Helge Stien, Tone Vagseth, Frode OppedalAbstract:Positioning of sea cages at sites with high Water current velocities expose the fish to a largely unknown environmental challenge. In this study we observed the swimming behaviour of Atlantic salmon (Salmo salar L.) at a commercial farm with tidal Currents altering between low, moderate and high velocities. At high current velocities the salmon switched from the traditional circular polarized group structure, seen at low and moderate current velocities, to a group structure where all fish kept stations at fixed positions swimming against the current. This type of group behaviour has not been described in sea cages previously. The structural changes could be explained by a preferred swimming speed of salmon spatially restricted in a cage in combination with a behavioural plasticity of the fish.
Frida Solstorm - One of the best experts on this subject based on the ideXlab platform.
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fast Water Currents reduce production performance of post smolt atlantic salmon salmo salar
Aquaculture Environment Interactions, 2015Co-Authors: Frida Solstorm, Anders Ferno, Frode Oppedal, David Solstorm, Thomas W K Fraser, Rolferik OlsenAbstract:In the future, an increasing number of salmon farms may be located in areas with fast Water current velocity due to limited availability of more sheltered locations. However, there is lit- tle information as to how fast Currents affect fish health and welfare. We used raceways to expose Atlantic salmon post-smolts (98.6 g, 22.3 cm) to homogeneous Water velocities corresponding to 0.2, 0.8 and 1.5 body lengths s �1 (slow, moderate and fast, respectively) over 6 wk. Fish at fast velocity had a 5% lower weight gain compared to fish at moderate and slow velocities, with a cor- responding reduction in length. Fish at moderate and fast velocities had lower lipid content in the muscle compared to fish at slow velocity. Hence, fish at slow and moderate velocities had the same weight gain, but fish at slow velocity gained more fat and fish at moderate velocity more muscle protein. Fish at fast velocity had a higher relative ventricular mass, indicating an increased cardiac workload. At slow velocity, individual fish displayed elevated plasma levels of lactate, osmolality and potassium. Our results suggest that post-smolts had the best growth and welfare at moderate velocity and that a current velocity of 1.5 body lengths s �1 could compromise production performance.
Thomas W K Fraser - One of the best experts on this subject based on the ideXlab platform.
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fast Water Currents reduce production performance of post smolt atlantic salmon salmo salar
Aquaculture Environment Interactions, 2015Co-Authors: Frida Solstorm, Anders Ferno, Frode Oppedal, David Solstorm, Thomas W K Fraser, Rolferik OlsenAbstract:In the future, an increasing number of salmon farms may be located in areas with fast Water current velocity due to limited availability of more sheltered locations. However, there is lit- tle information as to how fast Currents affect fish health and welfare. We used raceways to expose Atlantic salmon post-smolts (98.6 g, 22.3 cm) to homogeneous Water velocities corresponding to 0.2, 0.8 and 1.5 body lengths s �1 (slow, moderate and fast, respectively) over 6 wk. Fish at fast velocity had a 5% lower weight gain compared to fish at moderate and slow velocities, with a cor- responding reduction in length. Fish at moderate and fast velocities had lower lipid content in the muscle compared to fish at slow velocity. Hence, fish at slow and moderate velocities had the same weight gain, but fish at slow velocity gained more fat and fish at moderate velocity more muscle protein. Fish at fast velocity had a higher relative ventricular mass, indicating an increased cardiac workload. At slow velocity, individual fish displayed elevated plasma levels of lactate, osmolality and potassium. Our results suggest that post-smolts had the best growth and welfare at moderate velocity and that a current velocity of 1.5 body lengths s �1 could compromise production performance.
