Abstract
Changes in water temperature and oxygen: the effect of triploidy on performance and metabolism in large farmed Atlantic salmon
Highlights
The use of sterile triploid Atlantic salmon Salmo salar L. mitigates genetic interactions between escaped farmed and wild fish and minimises unwanted sexual maturation before harvest (Taranger et al 2010)
To investigate how the thermal performance and physiology of large (2.5 kg) triploid Atlantic salmon Salmo salar L. differs from those of diploids, both ploidies were subjected to water temperatures between 3 and 18°C
The present findings show that large triploid Atlantic salmon perform better at colder water temperatures compared to diploids and differ in parts of their physiological expression at increasing and high temperature
Summary
The use of sterile triploid Atlantic salmon Salmo salar L. mitigates genetic interactions between escaped farmed and wild fish and minimises unwanted sexual maturation before harvest (Taranger et al 2010). Atlantic salmon has ranged from 38 000 to 921 000 per year between 2005 and 2015 (Directorate of Fisheries Norway 2016). This has caused concerns regarding genetic interactions with wild stocks (Glover et al 2012), and highlights the incentives for the use of sterile salmon in commercial aquaculture (Benfey 2016). Previous studies have shown comparable growth rates in diploid and triploid Atlantic salmon during their first year at sea (Galbreath & Thorgaard 1995, Leclercq et al 2011, Fjelldal et al 2016), but this may be dependent on water temperature. The thermal optimum of large triploid Atlantic salmon with regards to feed intake and growth is unknown
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