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391 results for “Atlantic salmon”
F I G U R E 2 A in Migration patterns and navigation cues of Atlantic salmon post-smolts migrating from 12 rivers through the coastal zones around the Irish Sea
F I G U R E 2 A boxplot plot displaying the dates (mm-dd) when Atlantic salmon (Salmo salar) post-smolts (n = 582) were last detected in their natal river/estuary (Rivers Endrick, Gryffe, Roe, Faughan) or coastal embayment (River Burrishoole) and entered the coastal zones of the Irish Sea or the west coast of Ireland (River Burrishoole; Figure 1: Clew Bay) and were detected on monitoring lines A and B (excluding the River Burrishoole Figure 1). In the boxplots, the centre line represents the median, the box encompasses the 25 to 75% quartiles, the bars are the values within 1.5 interquartile units and the dots represent outliers. It should be noted that the dates when smolts were tagged (represented by the dashed black line) differed in each river system. The thick black lines divide rivers into their coastal regions (see methods).
F I G U R E 1 Map displaying the 14 in Migration patterns and navigation cues of Atlantic salmon post-smolts migrating from 12 rivers through the coastal zones around the Irish Sea
F I G U R E 1 Map displaying the 14 capture sites in 12 rivers where Atlantic salmon smolts (n = 1008) were captured for tagging in England, Scotland, Northern Ireland and the Republic of Ireland for this study. In addition, 60 hatchery origin smolts were tagged and released in the River Burrishoole. The coastal region each river belongs to is referenced in brackets next to the river name. Where Region one (1) refers to the Solway Firth (Rivers Derwent, Nith, Bladnoch); Region two (2) refers to the Clyde Estuary (Rivers Endrick and Gryffe); Region three (3) refers to the Bush Coastal region (rivers Bann, Bush, Carey and Glendun); Region four (4), refers to Lough Foyle (rivers Roe and Faughan); Region five (5), refers to Clew Bay (River Burrishoole). Tagged fish release sites are represented by stars, and acoustic receivers (n = 183) are represented by gray dots. Marine monitoring lines (A and B) in the Irish Sea are labeled in alphabetical order from south to north. Twenty-two acoustic receivers were initially deployed at monitoring line A. One hundred and eight acoustic receivers were deployed at monitoring line B and are labeled in numerical order from the furthest west receiver (R1) on the monitoring line to the furthest east (R108). Refer to Figure S2 for the locations of acoustic receivers that were not retrieved from marine monitoring line A (n = 2) and B (n = 9).
F I G U R E 2 in Global warming is projected to lead to increased freshwater growth potential and changes in pace of life in Atlantic salmon Salmo salar
F I G U R E 2 The four-step model workflow for quantitatively estimating length-at-age and life history of juvenile Atlantic salmon in response to climate change. Step 1 describes the collation of necessary data and construction of the water temperature model. Step 2 details the data preparation and construction of the length-at-age model for juvenile Atlantic salmon. Step 3 shows the coupling of the ISIMIP phase 3B projections to the water temperature model, and the subsequent coupling with the length-at-age model. Step 4 shows the post-processing of length-at-age projections to estimate smoltification probability and proportion of 1-, 2- and 3-year-old smolts. Shapes are according to ISO 5807 standard.
F I G U R E 3 in Migration patterns and navigation cues of Atlantic salmon post-smolts migrating from 12 rivers through the coastal zones around the Irish Sea
F I G U R E 3 The binomial General Linear Model (GLM) model showing the effect of minimum migration distance (Distance [km]) from the exit of smolts natal river/estuary to monitoring line B on the probability of migration success (measured as minimum migration success) of Atlantic salmon (Salmo salar) post-smolt through the Irish Sea. The shaded region is the 95% confidence interval of the final model.
F I G U R E 1 in Global warming is projected to lead to increased freshwater growth potential and changes in pace of life in Atlantic salmon Salmo salar
F I G U R E 1 Location of electrofishing sites (green circles) and fish traps (red circles) in the Burrishoole catchment, Co. Mayo, Ireland.
F I G U R E 1 in High summer temperatures are associated with poorer performance of underyearling Atlantic salmon (Salmo salar) in upland streams
F I G U R E 1 (a) Locations of sampling sites (circles) in the river Conon catchment, Northern Scotland. The map depicts the area within the black box in the inset map. (b) Daily maximum temperatures recorded in each stream during the study period (points represent the daily highest temperature for the entire stream, so may be either from the upper or lower sampling sites). Red values indicate temperatures>23 C, considered stressful to Atlantic salmon, while yellow values indicate temperatures between 20 C and 23 C, and blue values indicate temperatures <20 C. (c) Density and (d) biomass of underyearling Atlantic salmon, Salmo salar (both on a natural logarithmic scale, ± standard error) in relation to duration of peak temperatures (degree hours above 23 C) at sites in the River Conon catchment (n = 63 sections sampled across six sites in 2 years, 589 fish). All sites had the same initial density and genetic composition of eggs. Temperature: 0–20, 20–23, and>23. Year and sampling position: 2020 Downstream, 2020 Upstream, 2021 Downstream, and 2021 Upstream. Stream: Blackwater, Rannoch, and Vaich.
Atlantic salmon survival at sea: temporal changes that lack regional synchrony
<p>Spatial and temporal synchrony in abundance or survival trends can be indicative of whether populations are affected by common environmental drivers. In Atlantic salmon (<em>Salmo salar</em> L.), return rates to natal rivers have generally been assumed to be affected primarily by shared oceanic conditions, leading to spatially synchronous trends in mortality. Here, we investigate the existence of parallel trends in salmon sea survival, using data on migrating smolts and returning adults from seven Canadian populations presumed to share feeding grounds. We analyse sea survival, using a Bayesian change-point model capable of detecting non-stationarity in time series data. Our results indicate that while salmon have experienced broadly comparable patterns in survival, finer-scale temporal shifts are not synchronous among populations. Our findings are not consistent with the hypothesis that salmon populations consistently share the same mortality-related stressors in the marine environment. Although populations may have shared greater synchrony in survival patterns in the past, this synchrony may be breaking down. It may be prudent to direct greater attention to smaller-scale regional and population-level correlates of survival</p>
Assessing amino acid solubility of black soldier fly larvae meal in Atlantic salmon (Salmo salar) in vivo and in vitro
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Figure 2 in Evidence of late migrant smolts of Atlantic salmon (Salmo salar) in the Loire-Allier System, France
Figure 2. - Smolt number observed in Poutès (pk = 890 km), Chanteuges (pk = 863 km) and Varades (pk = 132 km) in 2009, 2010 and 2011. Grey area represents period of no catch (see text for details).
Figure 2 in Resorption of scales in Atlantic salmon (Salmo salar) during its anadromous migration: a quantitative study
Figure 2. - Variations of salmon scale ratios according to sex, sea age (grilse or spring salmon) and migration stage (ascending or spawning). A: RE1 ratio (total scale surface / fork length squared). B: RE2 ratio (anterior field surface / total scale surface). C: RE3 ratio (small radius / long radius of scale). SE = standard error.
Figure 5. - Scanning electron microscopy. A in Resorption of scales in Atlantic salmon (Salmo salar) during its anadromous migration: a quantitative study
Figure 5. - Scanning electron microscopy. A: View of a spawning male scale (F = focus); B: Detail of the anterior field of the same scale showing some Howship's lacunae (arrows), which are evidence for osteoclastic resorption.
Figure 1 in Resorption of scales in Atlantic salmon (Salmo salar) during its anadromous migration: a quantitative study
Figure 1. - Measurements taken on salmon scales. A: Scale of ascending spring salmon; B: Scale of spawning spring salmon. F: Focus; LR: long radius; SA: surface of the anterior field of the scale; SP: surface of the posterior field of the scale; SR: small radius.
Figure 1 in Marine protozoan epibionts on the copepod Lepeophtheirus salmonis, parasite of the Atlantic salmon
Figure 1. Ephelota gemmipara. (a) Schematic diagram of the body. ct, capitate tentacles; pt, prehensile tentacles; cv, contractile vacuole; ls, longitudinal striations; Ma, macronucleus; Mi, micronucleus; s, stalk; ts, tranversal striations. (b) Schematic diagram of a bud of Ephelota gemmipara. rcf, right ciliar field; lcf, left ciliar field; Ma, macronucleus.
Figures 2–7 in Marine protozoan epibionts on the copepod Lepeophtheirus salmonis, parasite of the Atlantic salmon
Figures 2–7. (2) A specimen of the copepod Lepeophtheirus salmonis showing the suctoria attached to its surface (×11). (3) Two individuals of Ephelota gemmipara showing the lobulate macronucleus, the tentacles and the stalk (×112). (4) Ephelota gemmipara. SEM photomicrography showing buds (×224). (5) Ephelota gemmipara. SEM photomicrography showing the distal part of the stalk and the body (×224). (6) Ephelota gigantea. General view of the body (×108). (7) Ephelota gigantea. Aspect of the anterior area of the body (×149).
Figure 8 in Marine protozoan epibionts on the copepod Lepeophtheirus salmonis, parasite of the Atlantic salmon
Figure 8. Ephelota gigantea. (a) Schematic diagram of the body. pt, prehensile tentacles; ct, capitate tentacles; cv, contractile vacuole; Ma, macronucleus; Mi, micronucleus; ls, longitudinal striations; s, stalk. (b) Schematic diagram of the fibrillar bands of the suprastylar area of the stalk. afb, anterior fibrillar band; ifb, intermediate fibrillar band; pfb, posterior fibrillar band.
Data analysis of Maamela et al. 2023 The effect of temperature and dietary energy content on female maturation and egg nutritional content in Atlantic salmon
<p>This folder includes the data and R scripts used in the data analysis of the Maamela et al. 2023 paper in Journal of Fish Biology.</p>
Postrelease exploration and stress tolerance of landlocked and anadromous Atlantic salmon and their hybrids
<p><strong>Background</strong></p> <p>We studied postrelease explorative behavior and stress tolerance of Landlocked and anadromous Atlantic salmon and their hybrids. For the research, we hybridized the Landlocked salmon of Lake Saimaa with a Baltic anadromous salmon from River Kymijoki, Southern Finland (strain originally from River Neva, Russia). These fish were hybridized in November 2017 and October 2018 in the Kainuu Fisheries Research Station, Paltamo, Kainuu, Finland (kfrs.fi).<br><br>In the data the fish are treated as four strains (column 'Strain'): <strong>1.</strong> Purebred Landlocked salmon (LLxLL), <strong>2. </strong>hybrids, where the maternal population was landlocked salmon (LLxBA), <strong>3. </strong>hybrids, where the maternal population was Baltic anadromous salmon (BAxLL) and <strong>4. </strong>purebred Baltic anadromous salmon (BAxBA).</p> <p><strong>Experiment 1. Post-release exploration</strong></p> <p>In experiment 1., consisting of two separate trials, we studied post-release exploration of the fish in four circular seminatural streams. (Datasets 'Exploration2018.csv' & 'Exploration2020.csv', see also 'Figure_1.jpg')</p> <p><strong>Experiment 2. Stress tolerance</strong></p> <p>In experiment 2. we studied the stress response and recovery of the fish (Dataset 'Stress_BernoulliData.csv', see also 'Figure_2.jpg').</p>
Pre-fertilisation gamete thermal environment influences reproductive success, unmasking opposing sex-specific responses in Atlantic Salmon
<p>The environment gametes perform in just before fertilisation is increasingly recognised to affect offspring fitness, yet the contributions of male and female gametes and their adaptive significance remain largely unexplored. Here, we investigated gametic thermal plasticity and its effects on hatching success and embryo performance in Atlantic salmon (Salmo salar). Eggs and sperm were incubated overnight at 2°C or 8°C, temperatures within the optimal thermal range of this species. Crosses between warm- and cold-incubated gametes were compared using a fully-factorial design, with half of each clutch reared in cold temperatures and the other in warm temperatures. This allowed disentangling single-sex interaction effects when pre-fertilisation temperature of gametes mismatched embryonic conditions. Pre-fertilisation temperature influenced the age at hatch, and matching sperm and embryo temperatures resulted in earlier hatching. Warm incubation benefited eggs but harmed sperm, reducing the hatching success and, overall, gametic thermal plasticity did not enhance offspring fitness, indicating vulnerability to thermal changes. We highlight the sensitivity of male gametes to higher temperatures, and that gamete acclimation may not effectively buffer against deleterious effects of thermal fluctuations. From an applied angle, we propose the differential storage of male and female gametes as a tool to enhance sustainability within the hatcheries.</p>
Time spent in distinct life-history stages has sex-specific effects on reproductive fitness in wild Atlantic salmon
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Chromosomal aberrations and early mortality in a non-mammalian vertebrate: example from pressure-induced triploid Atlantic salmon
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