Behaviour of rainbow trout, Salmo gairdneri Richardson, in marine cages |
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| Authors: | M J PHILLIPS |
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| Institution: | Scottish Marine Biological Association Dunstaffnage Marine Research Laboratory, Oban, Argyll, Scotland;. |
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| Abstract: | Abstract. Underwater television was used to observe the distribution and swimming behaviour of groups of farmed rainbow trout, Salmo gairdneri Richardson, in marine net cages. Undisturbed rainbow trout (mean total length 240 mm) aggregated near the surface, remaining motionless in slack water and formed polarized shoals at higher current velocities. Larger fish (mean total length 317 mm) occupied deeper parts of the cage and were more active during periods of slack water. The results are compared with previous work on farmed Atlantic salmon, Salmo salar L., and discussed in relation to the biology of wild rainbow trout and recent work on exercise, growth and condition in salmonids. |
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