AEI 8:659-664 (2016)  -  DOI: https://doi.org/10.3354/aei00207

NOTE
Critical swimming speed in groups of Atlantic salmon Salmo salar 

Mette Remen1,4, Frida Solstorm1, Samantha Bui2, Pascal Klebert3, Tone Vågseth1, David Solstorm1, Malthe Hvas1,*, Frode Oppedal

1Institute of Marine Research, 5984 Matredal, Norway
2Sustainable Aquaculture Laboratory - Temperate and Tropical, School of BioSciences, University of Melbourne, Parkville 3010, Australia
3SINTEF Fisheries and Aquaculture, 7465 Trondheim, Norway
4Present address: Akvaplan-niva AS, Pirsenteret, Havnegata 9, 7462 Trondheim, Norway
*Corresponding author:

ABSTRACT: Critical swimming speed (Ucrit) has traditionally been measured in relatively small swimming tunnels with 1 fish alone. However, both increased flume lengths and swimming in groups are known to improve performance. Atlantic salmon Salmo salar farming is currently expanding to more exposed locations, which necessitates guidelines for limits in water current peak velocity to secure animal welfare. A large swim tunnel system was therefore developed which allowed for swimming trials at relevant stocking densities of Atlantic salmon comparable to the conditions in exposed sea cages. Ucrit was measured in groups of 3 size classes (small post-smolts, large post-smolts, adults) in this new swim tunnel and compared to measurements from individual fish in a smaller swim tunnel. Ucrit (in cm s–1) increased with size and was significantly lower in the smaller setup. Our results suggest that Ucrit can be used as a maximum current velocity tolerance threshold in exposed aquaculture, where longer periods above this value would be detrimental to the welfare and physiological function of the fish. This study represents a starting point in obtaining suitable current velocity profiles for farmed Atlantic salmon during the on-growing phase in sea cages.


KEY WORDS: Exposed aquaculture · Swim tunnel · Ucrit · Atlantic salmon · Flume length · School


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Cite this article as: Remen M, Solstorm F, Bui S, Klebert P and others (2016) Critical swimming speed in groups of Atlantic salmon Salmo salar . Aquacult Environ Interact 8:659-664. https://doi.org/10.3354/aei00207

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