Effects of Pumping Height and Repeated Pumping in Atlantic Salmon Salmo salar
Journal article, Peer reviewed

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Date
2016-06-17Metadata
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Original version
Espmark, Å.M., Midling, K.Ø., Nilsson, J. and Humborstad, O.-B. (2016) Effects of Pumping Height and Repeated Pumping in Atlantic Salmon Salmo salar. Natural Resources, 7, 377-383. http://dx.doi.org/10.4236/nr.2016.76032 10.4236/nr.2016.76032Abstract
The aim of this study was to evaluate the effects of pumping height and repeated pumping on the
generalized stress response and gross injuries in harvest sized Atlantic salmon. Fish pumped from
a net pen at either high (5.2 m) or low (3.6 m) pumping heights showed an elevated, but not severe
physiological stress response (pH, pCO2, lactate, potassium, haematocrit, and sodium) compared
to fish netted (not pumped), while effects of different pumping heights were overall not demonstrated.
Repeated pumping (either 3 or 6 times) also caused an increase in stress response (pH,
pCO2, pO2, lactate, potassium and sodium) compared to control fish, and a positive dose-response
relationship was found for lactate. No fish died as a result of pumping, nor were injuries observed
that could exclusively be attributed to pumping. In conclusion, although elevated from the control
groups, the stress response following increasing pumping height and repeated pumping as conducted
in these experiments were not indicative of causing severe stress or injuries
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