Article
Fisheries
Jingwen Ding, Bengt Finstad, Lars Christian Gansel, Ann-Kristin Tveten, Steffen Hageselle Blindheim, Yanran Cao
Summary: This study evaluated the use of fecal corticoid metabolites (FCM) as stress indicators in farmed Atlantic salmon. The results showed that FCM levels correlated well with plasma cortisol levels during long-term stress. Standard sampling procedures and good experimental designs are necessary for reliable FCM measurements.
Article
Fisheries
Christian Karlsen, Andre Sture Bogevik, Aleksei Krasnov, Elisabeth Ytteborg
Summary: The study investigates the adverse effects of hydrogen peroxide on Atlantic salmon skin and promotes new research models.
Article
Physiology
Erik Hoeglund, Paulo Fernandes, Paula Rojas-Tirado, Jan Thomas Rundberget, Ole-Kristian Hess-Erga
Summary: This study evaluated water cortisol levels and feeding behavior as non-invasive indicators for assessing fish welfare in a commercial recirculating aquaculture system (RAS). The results showed that the insertion of smolt resulted in elevated water cortisol concentrations in the entire system, with a decrease in cortisol production over time. Feeding behavior was also affected, indicating a lack of appetite in newly inserted smolt. These findings suggest that waterborne cortisol and feeding behavior can be useful indicators for assessing the impact of stressors on fish welfare in commercial RAS.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Biochemistry & Molecular Biology
E. Fanjara, G. H. Aas, Y. Cao, V. Kristinova, A. Saeboe (Saebo), A. Stene
Summary: Cortisol and its metabolites play a crucial role in assessing fish stress and welfare status. LC-MS/MS techniques are effective in identifying and measuring these compounds. The compound 5 beta-THE is proposed as a potential stress biomarker. Pooling samples from multiple individuals is a reliable approach for stress evaluation in farmed fish.
JOURNAL OF STEROID BIOCHEMISTRY AND MOLECULAR BIOLOGY
(2023)
Article
Fisheries
Erik Hoglund, Ole Folkedal, Johan Aerts, Malthe Hvas, Oyvind overli, Anders-Mangor Jensen, Marco A. Vindas, Jonatan Nilsson, Tore Kristiansen
Summary: Water supply is limited in salmon hatcheries, so reduced water flow and oxygenation are used. However, reduced water exchange can lead to CO2 accumulation, causing hypercapnia and negative impacts on fish welfare. This study found that chronic hypercapnia affects stress coping mechanisms and growth in Atlantic salmon, highlighting the importance of physiological measures when assessing welfare in high CO2 systems.
Article
Environmental Sciences
P. A. Tang, N. Gharbi, T. O. Nilsen, M. Gorissen, S. O. Stefansson, L. O. E. Ebbesson
Summary: The successful transfer of farmed post-smolt Atlantic salmon depends on stress responses and cognitive functions, which may be challenged by increasing oceanic temperatures. This study examined the effects of transferring fish to different temperatures on stress responses and cognitive gene expression. The results showed that lower temperatures maintained normal stress responses, while higher temperatures inhibited stress responses and cognitive functions.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Fisheries
P. A. Tang, S. O. Stefansson, T. O. Nilsen, N. Gharbi, F. Lai, V Tronci, P. Balseiro, M. Gorissen, L. O. E. Ebbesson
Summary: The neural adaptions of post-smolt Atlantic salmon to cold water temperatures impact their stress resilience. Abruptly transferring post-smolt to lower temperatures resulted in altered telencephalic functions and reduced stress response capacities. However, after acclimation and prolonged exposure to lower temperatures, some level of stress resilience is still maintained.
Article
Physiology
Miiro Ilmari Virtanen, Monica Fengsrud Brinchmann, Deepti Manjari Patel, Martin Haugmo Iversen
Summary: The development of live monitoring sensor tags embedded within individuals has been driven by a desire to better understand fish welfare. This study on Atlantic salmon investigated the effects of tagging and daily crowding stress on stress responses and wound healing. The results showed that tagging did not cause chronic stress, but daily stress led to an allostatic overload type two response and delayed wound healing. These findings suggest that tagging can be successful in certain conditions, allowing for potential measurement of welfare indicators via smart-tags.
FRONTIERS IN PHYSIOLOGY
(2023)
Article
Biology
Eric H. Ignatz, Fabio S. Zanuzzo, Rebeccah M. Sandrelli, Kathy A. Clow, Matthew L. Rise, A. Kurt Gamperl
Summary: The study concluded that the stress response characteristics of Atlantic salmon at low temperatures do not accurately predict their survival and stress response at high temperatures. Interestingly, the salmon showed increased feed intake at temperatures up to 22 degrees C, contrary to previous findings. The results also suggest that the thermal tolerance of this population of salmon is high, questioning the relevance of CTMax in real-world temperature changes.
JOURNAL OF THERMAL BIOLOGY
(2021)
Article
Engineering, Marine
Bibbi Maria Kallay Hjelle, Albert Kjartan Dagbjartarson Imsland, Pablo Vigo Balseiro, Sigurd Olav Handeland
Summary: The AcuLice system, which uses a composite acoustic sound image, has been shown to effectively reduce the number of salmon lice on Atlantic salmon without causing additional stress to the fish.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Agriculture, Dairy & Animal Science
Satoshi Kusuda, Takashi Funahashi, Itsuki Adachi, Hanae Yamamoto, Eiji Nagao, Kirito Matsui, Yuki Akiba
Summary: The measurement of glucocorticoid metabolites (GCMs) in feces is a useful method for improving the husbandry and health management of the endangered Tsushima leopard cats. Changes in fecal GCM concentrations were observed during health examinations and treatment, indicating the role of GCMs in evaluating stress and disease.
Article
Fisheries
E. Svendsen, M. Fore, F. Okland, A. Grans, R. D. Hedger, J. A. Alfredsen, I Uglem, C. M. Rosten, K. Frank, U. Erikson, B. Finstad
Summary: Telemetry measurements of heart rate and swimming activity in farmed Atlantic salmon were found to be useful proxies for stress, as indicated by increased levels of cortisol, glucose, lactate, and osmolality following physical stress. These measurements can potentially be used for online stress monitoring in full scale production.
Article
Multidisciplinary Sciences
Victor H. S. Oliveira, Katharine R. Dean, Lars Qviller, Carsten Kirkeby, Britt Bang Jensen
Summary: This study found that baseline mortality of Atlantic salmon in Norway is influenced by factors such as sea lice treatments, stocking month, weight, sea surface temperature, and salinity. Understanding these factors can help reduce mortality in aquaculture.
SCIENTIFIC REPORTS
(2021)
Article
Agriculture, Dairy & Animal Science
Paula Serres-Corral, Hugo Fernandez-Bellon, Pilar Padilla-Sole, Annais Carbajal, Manel Lopez-Bejar
Summary: The study assessed the physiological response of a lion pride to a change in management and social conditions after the death of the dominant male. Lower cortisol metabolite concentrations in feces were detected after the death, indicating a positive impact of decreased daily management routines and a more stable social environment. Individualized hormone concentrations revealed variable physiological responses among lions, emphasizing the importance of monitoring hormonal profiles individually.
Article
Fisheries
Raul Jimenez-Guerrero, Grete Baeverfjord, Oystein Evensen, Kristin Hamre, Thomas Larsson, Jens-Erik Dessene, Kjellrun-Hoas Gannestad, Turid Morkore
Summary: Focal dark spots (DS) are a common quality problem in farmed Atlantic salmon, and this study examines the association between abnormal rib morphology and DS types, as well as the frequency of rib abnormalities. Rib abnormalities were found in most fish, with an increase in abnormal ribs after transfer to sea-cages. Abnormalities in farmed salmon were concentrated in the center and distal parts of ribs, similar to the distribution of DS.