Pacific salmon (genus Oncorhynchus) exhibit an interesting and uncommon life-history pattern that combines semelparity, anadromy, and navigation (homing). During smoltification, young salmon imprint on the chemical composition of their natal stream water (the home-stream olfactory bouquet or "HSOB"); they then migrate to the ocean where they spend a few years feeding prior to migrating back to their natal freshwater stream to spawn. Upstream migration is guided by the amazing ability to discriminate between the chemical compositions of different stream waters and thus identify and travel to their home-stream. Pacific salmon demonstrate marked somatic and neural degeneration changes during home-stream migration and at the spawning grounds. The appearance of these pathologies is correlated with a marked elevation in plasma cortisol levels. While the mechanisms of salmonid homing are not completely understood, it is known that adult salmon continuously utilize two of their primary sensory systems, olfaction and vision, during homing. Olfaction is the primary sensory system involved in freshwater homing and "HSOB" recognition, and will be emphasized here. Previously, we proposed that the increase in plasma cortisol during Pacific salmon home-stream migration is adaptive because it enhances the salmon's ability to recall the imprinted memory of the "HSOB" (Carruth, 1998; Carruth et al., 2000b). Elevated plasma concentrations of cortisol could prime the hippocampus or other olfactory regions of the brain to recall this memory and, therefore, aid in directing the fish to their natal stream. Thus, specific responses of salmon to stressors could enhance reproductive success.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/icb/42.3.574 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Extended Photoperiod Facilitated the Restoration of the Expression of GH-IGF Axis Genes in Submerged Rainbow Trout ().
Int J Mol Sci
December 2024
Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China.
Salmonids, classified as physostomous fish, maintain buoyancy by ingesting air to inflate their swim bladders. Long-term submergence has been shown to cause body imbalance and reduced growth performance in these fish. Previous studies have demonstrated that extended photoperiod can promote growth in salmonids.
View Article and Find Full Text PDFPRDM9 drives the location and rapid evolution of recombination hotspots in salmonid fish.
PLoS Biol
January 2025
Institut de Génétique Humaine, Univ Montpellier, Centre National de la Recherche Scientifique, Montpellier, France.
In many eukaryotes, meiotic recombination occurs preferentially at discrete sites, called recombination hotspots. In various lineages, recombination hotspots are located in regions with promoter-like features and are evolutionarily stable. Conversely, in some mammals, hotspots are driven by PRDM9 that targets recombination away from promoters.
View Article and Find Full Text PDFLinking Fire, Food Webs, and Fish in Stream Ecosystems.
Ecosystems
January 2025
Oregon State University, Department of Forest Ecosystems & Society, Corvallis, Oregon USA.
Article Synopsis
- Wildfire regimes are altering, raising concerns for aquatic ecosystems and fish species, as predicting fish responses can be complex due to multiple wildfire impacts.
- Whole-ecosystem approaches like food web modeling can help understand these interactions, showing how different wildfire severities affect aquatic life dynamics in streams.
- Simulations reveal that wildfires can have varying effects on periphyton, invertebrates, and fish biomass, influenced by fire severity and environmental changes, indicating a need to consider context when assessing wildfire impacts on aquatic ecosystems.
Subgroup specific transcriptional regulation of salmonid non-classical MHC class I L lineage genes following viral challenges and interferon stimulations.
Front Immunol
January 2025
Norwegian College of Fishery Science, Faculty of Bioscience, Fisheries and Economics, University of Tromsø - The Arctic University of Norway, Tromsø, Norway.
Non-classical MHC class I genes which, compared to classical MHC class I, are typically less polymorphic and have more restricted expression patterns are attracting interest because of their potential to regulate immune responses to various pathogens. In salmonids, among the numerous non-classical MHC class I genes identified to date, L lineage genes, including Sasa- and , are differentially induced in response to microbial challenges. In the present study, we show that while transcription of both and are induced in response to SAV3 infection the transcriptional induction patterns are distinct for each gene.
View Article and Find Full Text PDFProduction of Oncorhynchus mykiss biosensor based on polyvinyl alcohol/chitosan nanocomposite using phycocyanin during refrigerated storage.
Sci Rep
January 2025
Department of Food Hygiene, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Smart packaging, also known as intelligent packaging, is responsive to external stimuli, moisture, light, oxygen, heat, pH, and bacterial growth. In this study, polyvinyl alcohol/nanochitosan/phycocyanin nanocomposite (PVA/NCH/PC-NC) for fish fillets of Oncorhynchus mykiss rainbow trout coating was prepared. Five treatments were prepared over a period of 14 days (0, 1, 7 and 14 days) under treatments of T: fish coated with PVA/NCH-NC without PC; T, T T and T fish coated with PVA/NCH/PC-NC (0.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!