Article
Multidisciplinary Sciences
Matti Janhunen, Jorma Piironen, Anssi Vainikka, Pekka Hyvarinen
Summary: Enrichment of rearing environment with natural elements can improve the welfare and post-release survival of critically endangered landlocked Atlantic salmon, although it may lead to greater growth variation and physical damages during development.
Article
Fisheries
Benedikte Austad, L. Asbjorn Vollestad, Anders Foldvik
Summary: Otoliths are important inner-ear structures for teleost fish, mainly composed of aragonite but sometimes vaterite. Abnormal otoliths can impact fish's inner-ear functions and may indicate environmental stress. The study found high frequency of vateritic otoliths in hatchery-reared Atlantic salmon, with potential negative effects on marine survival. There was also controversy regarding the influence of fast growth on abnormal otolith formation.
JOURNAL OF FISH BIOLOGY
(2021)
Article
Fisheries
Nicholas Robinson, Christian Karlsen, Elisabeth Ytteborg, Aleksei Krasnov, Jascha Gerwins, Hanne Johnsen, Jelena Kolarevic
Summary: Recirculating aquaculture systems (RAS) have potential benefits, such as reducing water use and improving biosecurity, but may hinder the early development of Atlantic salmon, leading to thinner epidermis, less vertebral mineralization, and altered gene expression related to bone and skin development. These differences in early development could potentially affect the robustness of salmon at later life stages.
Article
Environmental Sciences
Mahboobeh Hajiesmaeili, Louis Addo, Johan Watz, Steven F. Railsback, John J. Piccolo
Summary: In this study, an individual-based model (IBM) was developed to investigate the impact of hydropeaking on the growth, survival, and distribution of native brown trout and Atlantic salmon juveniles in river Gullspang, Sweden. The results show that hydropeaking generally has modest negative effects on the growth and survival of both species.
RIVER RESEARCH AND APPLICATIONS
(2023)
Article
Fisheries
Michael D. Tillotson, Timothy F. Sheehan, Brandon Ellingson, Ruth E. Haas-Castro, Maxime Olmos, Katherine E. Mills
Summary: The productivity of Atlantic salmon has declined since the 1980s due to changing ocean conditions, but the mechanisms behind this decline are still unclear. Research on North American multi sea-winter salmon scales showed changes in marine growth over the past 50 years, with an overall increase despite declining survival. The study found evidence of a non-stationary influence of post-smolt growth on survival, suggesting a divergence in the mechanisms determining marine survival of North American and European salmon populations around 1990.
ICES JOURNAL OF MARINE SCIENCE
(2021)
Article
Fisheries
Cecilie I. Nilsen, Knut Wiik Vollset, Gaute Velle, Bjorn Torgeir Barlaup, Eirik Straume Normann, Elisabeth Stoger, Robert James Lennox
Summary: Hatcheries are commonly used for Atlantic salmon population support or restoration, but little is known about the impact of rearing on the behavior and fitness of hatchery adults that return to spawn. A study conducted in Norway compared the migration patterns of hatchery (N=16) and wild (N=12) Atlantic salmon using acoustic telemetry. The study found that hatchery-origin salmon exhibited abnormal reverse movement behavior, moving frequently between the river and fjord, which was not observed in wild salmon. Survival and outmigration timing after spawning did not differ between the two groups. The behavioral differences observed in hatchery-origin salmon may have implications for stock assessments used to evaluate restoration progress, particularly if they affect catchability or detections of returning adults.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2023)
Article
Biotechnology & Applied Microbiology
Petra R. Quezada-Rodriguez, Richard S. Taylor, Khattapan Jantawongsri, Barbara F. Nowak, James W. Wynne
Summary: This study aimed to investigate the relationship between microbial community profiles and gill pathology during a production cycle of Atlantic salmon in two commercial hatcheries. The relationships between gill histology, environmental conditions, and microbiome were determined using high-throughput data, and it was found that the commensal community of gill bacteria was related to melanin prevalence under commercial conditions.
JOURNAL OF APPLIED MICROBIOLOGY
(2023)
Article
Veterinary Sciences
Aurelien Delaval, Martine Roysted Solas, Helge Skoglund, Anne Gro Vea Salvanes
Summary: Sagittal otoliths in hatchery-reared juvenile Atlantic salmon can be affected by vaterite, which may impair hearing and balance. However, structural tank enrichment did not directly affect vaterite formation. After release into the wild, salmon fry with vaterite otoliths were less likely to be eaten by predators and more likely to be recaptured in the river.
FRONTIERS IN VETERINARY SCIENCE
(2021)
Article
Multidisciplinary Sciences
Knut Wiik Vollset, Kurt Urdal, Kjell Utne, Eva B. Thorstad, Harald Saegrov, Astrid Raunsgard, Oystein Skagseth, Robert J. Lennox, Gunnel M. Ostborg, Ola Ugedal, Arne J. Jensen, Geir H. Bolstad, Peder Fiske
Summary: Evidence suggests the presence of an ecosystem-scale regime shift in the Northeast Atlantic Ocean, characterized by a sudden decrease in growth of Atlantic salmon and mackerel, as well as a decrease in the proportion of early maturing Atlantic salmon. These changes may be related to factors such as the decline in Arctic water extent in the Norwegian Sea and a reduction in zooplankton in the Northeast Atlantic Ocean.
Article
Fisheries
Ingun Naeve, Sven Arild Korsvoll, Nina Santi, Matias Medina, Arnfinn Aunsmo
Summary: This study investigates the impact of 50 years of balanced genetic selection on the growth and productivity of the Norwegian Atlantic salmon industry. The results show that increasing the genetic potential of Atlantic salmon through selection can significantly increase production and reduce production time, contributing to sustainability and resource utilization. The study demonstrates the importance of genetic selection in predicting the future development and growth of aquaculture production.
Article
Multidisciplinary Sciences
Audun H. Rikardsen, David Righton, John Fredrik Strom, Eva B. Thorstad, Patrick Gargan, Timothy Sheehan, Finn Okland, Cedar M. Chittenden, Richard D. Hedger, Tor F. Naesje, Mark Renkawitz, Johannes Sturlaugsson, Pablo Caballero, Henrik Baktoft, Jan G. Davidsen, Elina Halttunen, Serena Wright, Bengt Finstad, Kim Aarestrup
Summary: The study found that the mechanisms driving range-wide reductions in Atlantic salmon marine survival are hindered by a lack of understanding of their oceanic ecology and distribution. The individual salmon migrated further and in different directions than previously reported, showing increased diving activity near oceanographic fronts, highlighting the importance of these regions as feeding areas. Differences in oceanic distribution among individuals and populations may contribute to variations in growth and survival due to environmental conditions.
SCIENTIFIC REPORTS
(2021)
Article
Fisheries
Alexandre Erraud, Marc Bonnard, Valerie Cornet, Imen Ben Ammar, Sascha Antipine, Quentin Peignot, Jerome Lambert, Syaghalirwa N. M. Mandiki, Patrick Kestemont
Summary: By investigating the impact of different biological factors on sperm quality and reproductive success, it was found that sperm quality of early parr from captivity was poorer when subjected to cryopreservation, resulting in reduced reproductive success. Therefore, it is recommended that only the semen of anadromous males should be cryopreserved.
Article
Fisheries
Richard Beamish, Chrys Neville
Summary: The commercial and recreational fishery for Coho Salmon in the Strait of Georgia declined in the 1990s and was closed in 1998. It was observed that ocean carrying capacity seemed to regulate production more than the number of juvenile Coho Salmon. Even with a 52% reduction in releases of Coho Salmon from Canadian hatcheries from 2010-2018, the average abundance of hatchery fish surviving through to September of their first ocean year did not change.
Article
Fisheries
Cecilie Sviland Walde, Marit Stormoen, Jostein Mulder Pettersen, David Persson, Magnus Vikan Rosaeg, Britt Bang Jensen
Summary: Infestations with salmon lice and the management of these lice pose significant challenges and costs in marine salmonid aquaculture. Treatment against salmon lice, particularly non-medicinal methods, can lead to stress and physical injuries in Atlantic salmon, resulting in reduced appetite and increased mortality. This study analyzed production data from Norwegian aquaculture companies to estimate the short-term growth loss of Atlantic salmon following different treatments for salmon lice removal. The results showed that non-medicinal treatments had a greater negative impact on growth compared to medicinal treatments, and the timing of treatment played a role in the treatment outcome.
Article
Fisheries
Robert J. Lennox, Elisabeth Stoger, Lotte S. Dahlmo, Turid Helle, Tore Wiers, Erlend M. Hanssen, Knut Wiik Vollset
Summary: Tagging salmon smolts with passive integrated transponder (PIT) tags has been a common method to monitor phenology. However, the validity of tagging has been questioned. This study found that smolts with longer length migrated earlier, but the tag types did not affect the timing of migration. Tagging treatment did not have an effect on smolts' growth.
JOURNAL OF FISH BIOLOGY
(2022)