Acute stress-induced mortality in big Atlantic salmon at high temperatures is associated with insufficient oxygen uptake capacity.

Thermal studies on fish can help us to understand their robustness to warming climates. Most experiments are performed on smaller individuals and may not represent larger life-stages owing to physiological scaling effects, particularly with regards to thermal tolerance and respiratory capacities. In this study, respirometry experiments were performed on big Atlantic salmon (Salmo salar) (≈4 kg) following 3-weeks acclimation to seawater of 9 °C or 19 °C.

The Behavioral and Neurobiological Response to Sound Stress in Salmon.

Introduction: Noise associated with human activities in aquatic environments can affect the physiology and behavior of aquatic species which may have consequences at the population and ecosystem levels. Low-frequency sound is particularly stressful for fish since it is an important factor in predator-prey interactions. Even though behavioral and physiological studies have been conducted to assess the effects of sound on fish species, neurobiological studies are still lacking.

Sentinels in Salmon Aquaculture: Heart Rates Across Seasons and During Crowding Events.

Advances in tag technology now make it possible to monitor the behavior of small groups of individual fish as bioindicators of population wellbeing in commercial aquaculture settings. For example, tags may detect unusual patterns in fish heart rate, which could serve as an early indicator of whether fish health or welfare is becoming compromised. Here, we investigated the use of commercially available heart rate biologgers implanted into 24 Atlantic salmon weighing 3.

The effect of temperature on ability of Lepeophtheirus salmonis to infect and persist on Atlantic salmon.

The salmon louse (Lepeophtheirus salmonis) is an ecologically and economically important parasite of salmonid fish. Temperature is a strong influencer of biological processes in salmon lice, with development rate increased at higher temperatures. The successful attachment of lice onto a host is also predicted to be influenced by temperature; however, the correlation of temperature with parasite survival is unknown.

Production and verification of the first Atlantic salmon (Salmo salar L.) clonal lines.

Background: In several fish species homozygous and heterozygous clonal lines have been produced using gynogenetic and androgenetic techniques. These lines are standardized and can be reproduced over generations. In rainbow trout such lines have existed for decades and has become important research tools in genome studies as well as in studies of commercially important traits.

Salmonid fish: model organisms to study cardiovascular morphogenesis in conjoined twins?

Background: There is a gap in knowledge regarding the cardiovascular system in fish conjoined twins, and regarding the cardiovascular morphogenesis of conjoined twins in general. We examined the cardiovascular system in a pair of fully developed ventrally conjoined salmonid twins (45.5 g body weight), and the arrangement of the blood vessels during early development in ventrally conjoined yolk sac larvae salmonid twins (<0.

Aplasia of the septum transversum has no effect on plasma biochemistry following an acute hypoxic event in Atlantic salmon.

Aplasia of the septum transversum (AST) is a malformation that results in alterations in ventricle morphology. The condition has been linked to increased mortality during periods of increased cardiac demand in Atlantic salmon Salmo salar. The blood plasma biochemical response to an acute hypoxic event (1 h at 31-39% O₂saturation) was investigated in fish with and without a septum transversum to assess levels of anaerobic respiration (lactate) and the stress response (cortisol, glucose, osmolality, Na⁺, Cl⁻ and K⁺).

The interaction between water currents and salmon swimming behaviour in sea cages.

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.