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FIGURE 6 in Effects of repeated anaesthesia on gill and general health of Atlantic salmon, Salmo salar
FIGURE 6 Mean (+SE) expression of selected genes from Salmo salar head kidney relative to the housekeeping gene elongation factor α (elfα). Head kidney was analysed after a single (n = 10) or repeated exposure (n = 30) to (a) MS-222 (80 mg l−1) () Single, and () Repeat, (b) metomidate (12.5 mg l−1) () Single, and () Repeat and (c) AQUI-S (17 mg l−1) () Single, and () Repeat. Log -transformed data were 10 compared by one-way ANOVA. *P <0.05
FIGURE 3 in Effects of repeated anaesthesia on gill and general health of Atlantic salmon, Salmo salar
FIGURE 3 Mean epithelial lifting score (Table 1) for Salmo salar gills assessed by histology after repeated or single dose exposures of fish to the anaesthetics MS-222 (80 mg l−1), metomidate (12.5 mg l−1) and AQUI-S (17 mg l−1). Different letters denote significant differences (P <0.05) between groups assessed by ordinal regression analysis
FIGURE 5 in Effects of repeated anaesthesia on gill and general health of Atlantic salmon, Salmo salar
FIGURE 5 Mean (+SE) relative expression of selected genes in Salmo salar gills. Gene expression level was quantified by real-time PCR, normalized using the housekeeping gene elongation factor α (elfα), and expressed as arbitrary unit where the expression in single exposure is 1. Gills were analysed after a single (n = 10) or repeated exposure (n = 30) to (a) MS-222 (80 mg l−1) () Single, and () Repeat, (b) metomidate (12.5 mg l−1) () Single, and () Repeat and (c) AQUI-S (17 mg l−1) () Single, and () Repeat. Log -transformed data were 10 compared by one-way ANOVA. *P <0.05; **, P <0.01; ***P <0.001
F I G U R E 4 in Variation in the post-smolt growth pattern of wild one sea-winter salmon (Salmo salar L.), and its linkage to surface warming in the eastern North Atlantic Ocean
F I G U R E 4 Time-series changes in ocean surface temperature and Salmo salar scale growth pattern. (a) Changes in monthly SST anomaly for the 250 and 500 km standard deviation spatially weighted kernels in the Norwegian Sea (April 1992 – March 2011). (b) Changes in frequency (proportion within years) of selected growth patterns. The three selected pattern groupings illustrate fish showing persistent Fast growth (F) throughout the post-smolt growth season, Slow growth followed by Fast growth (SF), and all patterns pooled that displayed one or more growth Checks. The growth pattern data for each capture year (b) are aligned with the SST anomaly in April of the previous year (a), coinciding with the commencement of annual smolt emigration
F I G U R E 5 in Variation in the post-smolt growth pattern of wild one sea-winter salmon (Salmo salar L.), and its linkage to surface warming in the eastern North Atlantic Ocean
F I G U R E 5 Monthly correlations between the SST anomalies throughout the post-smolt Salmo salar growth period and annual frequency of the Fast (F) and All Check growth patterns. The salmon data were lagged by -1 year to match the annual post-smolt growth seasons to the SST anomalies. Significant correlations (P <0.05; following adjustment of d.f. to allow for autocorrelation) are shown by the filled circles
FIGURE 8 in Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system
FIGURE 8 Mean (S.E.; n = 30) relative gene transcription values for (a) mef2c () Reference, and () Preline, (b) gata4 () Reference, and () Preline and (c) vegf () Reference, and () Preline using ef1α as standard in Salmo salar heart, both in fresh water and after rearing in Preline semiclosed containment system (S-CCS;) and reference group open pen () for 4 months in seawater. Significant differences between groups are indicated by different lower-case letters
FIGURE 2 in Effects of repeated anaesthesia on gill and general health of Atlantic salmon, Salmo salar
FIGURE 2 Differential-interference contrast images of Salmo salar gill after dosing with three anaesthetic agents: (a) single and (d) repeat exposure to MS-222 (80 mg l−1); (b) single and (e) repeat exposure to metomidate (12 mg l−1); (c) single and (f) repeat exposure to AQUI-S (17 mg l−1). e, epithelial cell; sl, secondary lamella; p, pillar cell; g, goblet cell; pl, primary lamellae; er, erythrocyte., Area showing evidence of epithelial lifting; S.I., foci of mild subepithelial infiltration. Scale bar 100 μm. Magnification ×400
FIGURE 1 Log2 in Effects of repeated anaesthesia on gill and general health of Atlantic salmon, Salmo salar
FIGURE 1 Log2 mean (SD, n = 3) repeat-treatment induction times of Salmo salar () to Stage III, Plane 1 anaesthesia with MS-222 (80 mg l−1), metomidate (12.5 mg l−1) and AQUI-S (17 mg l−1). P> 0.05 for each anaesthetic, as assessed by repeated measures ANOVA () MS-222, () Metomidate, and () AQUI-S
FIGURE 7 in Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system
FIGURE 7 Mean (S.E.; n = 30) relative gene transcription values for (a) Igf-I () Reference, and () Preline, (b) igf1ra () Reference, and () Preline, and (c) igf1bp1a () Reference, and () Preline using ef1α as standard in Salmo salar muscle, both in fresh water and during rearing in Preline semiclosed containment system (S-CCS;) and reference group (). Significant differences through time are denoted with capital letters within the reference group and lower-case letters within Preline S-CCS. SW, seawater
FIGURE 3 in Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system
FIGURE 3 Mean [S.E.; n = 30; (a), (c), (d)] Salmo salar growth in mass (M) fork length (LF) and Fulton's condition factor (K) measured in freshwater (15 April 2016) and during the post-smolt phase (1–2 June; 1–2 June and 29–30 August 2016) (a) Measured mass () Preline, and () Reference, (b) estimated mean mass (Fishtalk calculations, CEF = 1.1) () Reference, and () Preline, (c) mean fork length () Preline, and () Reference and (d) condition factor (K) () Preline, and () Reference. Estimated mean mass covers both the post-smolt phase 5 May to 30 August, and the growth phase 31 August to 30 November. Changeover is indicated with a dot in the figure. SW, seawater. Significant difference between groups; *p <0.05; ***p <0.001
FIGURE 4 in Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system
FIGURE 4 Accumulated mortality of Salmo salar in the Preline semiclosed containment system (S-CCS) 30 April to 30 August followed by the open pen growth phase (Buholmen) from 1 September to 30 November (;, changeover from S-CCS to open pen). The accumulated mortality in the reference group covers the period 5 May to 30 November ()
FIGURE 5 in Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system
FIGURE 5 Mean (+S.E.) Salmo salar skeletal muscle fibre diameter frequency distribution reared in Preline semi-closed containment system () and reference S. salar () after 4 months in seawater. Significant difference between groups; *p <0.05; ***p <0.001
FIGURE 2 in Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system
FIGURE 2 (a) Alternate day mean water temperature and (b) salinity at the Salmo salar post- smolt Preline semi-closed containment system () and reference group () rearing systems between 5 May and 30 November 2016. Data from Preline S-CCS represents the Buholmen open-pen between 31 August and 30 November 2016
FIGURE 1 in Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system
FIGURE 1 (a) Location of experiment area in Norway and (b) locations of the Preline semi-closed containment system (S-CCS), reference, freshwater and growing phase groups of Salmo salar post-smolts in Hordaland region; (c) schematic of the S-CCS; (d) standard open sea cages for S. salar production in Norway; (e) drawing of an open conical pen used to hold the reference group of fish
FIGURE 6 in Comparison between Atlantic salmon Salmo salar post-smolts reared in open sea cages and in the Preline raceway semi-closed containment aquaculture system
FIGURE 6 Mean (S.E.; n = 30) plasma IGF-I concentration of Salmo salar in both fresh water and during rearing in Preline S- semi-closed containment system (S-CCS;) and reference group (). Significant differences trough time are denoted with capital letters within the reference group, lower-case letters within the Preline S-CCS group and significant differences between rearing systems are shown: **p <0.01; ***p <0.001. SW, seawater
Figures 2 and 3 in Variation in the post-smolt growth pattern of wild one sea-winter salmon (Salmo salar L.), and its linkage to surface warming in the eastern North Atlantic Ocean
Figures 2 and 3 summarize the under/over-representation of the more common growth patterns and years, respectively, amongst the k = 20 clusters. The SF growth pattern was over-represented for four of the five clusters of sub-branch A, in association with general underrepresentation of patterns showing an initial Fast (F) sequence (Figure 2). Sub-branch B revealed an essentially inverse structure to sub-branch A, with sporadic over-representation of patterns commencing with a Fast sequence and under-representation of those with an initial Slow sequence. Sub-branches C and D were heterogeneous
F I G U R E 3 in Variation in the post-smolt growth pattern of wild one sea-winter salmon (Salmo salar L.), and its linkage to surface warming in the eastern North Atlantic Ocean
F I G U R E 3 Tabulation of significant under- and overrepresentation of the 20 dendrogram clusters amongst years of capture of return adult Salmo salar. Details as for Figure 2
Figure 4b in Variation in the post-smolt growth pattern of wild one sea-winter salmon (Salmo salar L.), and its linkage to surface warming in the eastern North Atlantic Ocean
Figure 4b shows that there was (a) a decrease in the frequency of fish showing consistently Fast growth throughout the post-smolt period, (b) an increase in the frequency of the SF growth pattern and (c) an increase in the frequency of growth patterns including one or more Check sequences. Furthermore, these time-series changes in circulus pattern were linked significantly to contemporaneous and anomalous warming of the Norwegian Sea (Figure 5). As shown in Figure 6, one proximate consequence of these changes is manifest in the backcalculated mean length of fish at the midpoint of the winter annulus, following the completion of the post-smolt growth season. This showed a marked and significant decrease across the final six capture years of the time series.
F I G U R E 2 in Movement and habitat shift responses of juvenile Atlantic Salmon (Salmo salar) to annually permanent stream flooding
F I G U R E 2 Mahers River study reach, Newfoundland, showing the habitat conditions before (riffle run) and after (pool) annual flooding.
F I G U R E 1 in Movement and habitat shift responses of juvenile Atlantic Salmon (Salmo salar) to annually permanent stream flooding
F I G U R E 1 Mahers River and North Arm River, Newfoundland, Canada. The seasonally created pool (Flooded Pool reach) is located within Mahers River. Two control reaches were located in Mahers River; one immediately upriver of the created pool habitat (Riffle Above Pool reach) and another approximate 3 km upstream (Mahers Control reach) and two additional control reaches were located in the nearby North Arm River (North Arm 1 and 2).
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