Occurrence of Hematozoa in Atlantic Salmon (Salmo salar) Smolts and Adults in an English River

1974 ◽  
Vol 31 (11) ◽  
pp. 1790-1792 ◽  
Author(s):  
D. H. McCarthy
Keyword(s):  
Statistical Analysis ◽  
Atlantic Salmon ◽  
Fresh Water ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
Significant Difference

The percentages of hemoflagellates found in single samples of Atlantic salmon (Salmo salar) from the River Exe, Devon, in 1971 (122 fish) and 1973 (50 fish) were 33 and 32; of hemogregarines, 18 and 22. The percentages for 21 adults taken in the estuary in August 1971 were 14 and 0, respectively; in 9 adults taken in the estuary in March 1972 and in 9 taken in fresh water in November 1971, no hematozoa were found. Statistical analysis of hemoglobin data showed no significant difference between parasitized and healthy fish. Neither the specific identities nor the vectors of the hematozoa were determined.

scholarly journals Comparison of the Fatty Acid and Triglyceride Profiles of Big Eye Tuna (Thunnus obesus), Atlantic salmon (Salmo salar) and Bighead Carp (Aristichthysnobilis) Heads

Molecules ◽  
2019 ◽  
Vol 24 (21) ◽  
pp. 3983 ◽  
Author(s):  
Jing Zhang ◽  
Ningping Tao ◽  
Yueliang Zhao ◽  
Xichang Wang ◽  
Mingfu Wang
Keyword(s):  
Fatty Acid ◽  
Atlantic Salmon ◽  
Fresh Water ◽  
Salmo Salar ◽  
Bighead Carp ◽  
Fresh Water Fish ◽  
Atlantic Salmon Salmo Salar ◽  
Thunnus Obesus ◽  
Significant Difference ◽  
Latent Structures

Big eye tuna (Thunnus obesus), Atlantic salmon (Salmo salar) and bighead carp (Aristichthys nobilis) are three representative marine and fresh water fishes. In this study, the content of total lipids (TL), triglyceride (TG) fraction, and the fatty acid profiles in the corresponding fish heads were analyzed. Meanwhile, their complicated TG molecular species were further characterized. The results showed that TG was the major lipid in these three fish heads (60.58–86.69%). Compared with other two fish heads, big eye tuna head was the most abundant in polyunsaturated fatty acids, among which eicosapentaenoic acid (EPA) + docosahexaenoic acid (DHA) accounted for 64.29% and 32.77% in the TL and TG fraction, respectively. It is also worth noting that EPA+DHA/total fatty acid (TFA) value of TL and TG fraction from bighead carp head showed no significant difference with Atlantic salmon head, a typical marine fish. There were 146 TG molecules detected in big eye tuna head, 90 in Atlantic salmon and 87 in bighead carp heads. DHA or EPA accounted for 56.12%, 22.88%, and 5.46% of the total TG molecules in these three fish heads, respectively. According to principal component analysis, orthogonal projection to latent structures-discriminant analysis and the constructed heat map, the three samples could be completely differentiated based on their TG molecule fingerprints. This study is the first to compare marine and fresh water fish from the perspective of their heads’ fatty acid and TG molecule profiles.

Effects of Jaw Tagging on Growth and Scale Characteristics of Landlocked Atlantic Salmon, Salmo salar

1971 ◽  
Vol 28 (4) ◽  
pp. 537-542 ◽  
Author(s):  
Kendall Warner
Keyword(s):  
Growth Rate ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Spawning Grounds ◽  
Atlantic Salmon Salmo Salar ◽  
Growth Increments ◽  
Significant Difference ◽  
Scale Characteristics

Recapture of 165 annual and biennial spawners of landlocked Atlantic salmon (Salmo salar) from 1239 fish tagged on the spawning grounds from 1953 to 1955 at the Fish River Lakes, Maine, showed that jaw-tagged females grew significantly slower than untagged female of identical ages and cycles. For most maturing male salmon, growth increments were not significantly reduced by jaw tagging. A tendency for decreased growth increments with increase in age was apparent for both tagged and untagged fish.Recognizable annuli were formed on the scales of 77–100% of 97 male salmon and of 74–97% of 187 female salmon between tagging and recapture. A significantly smaller percentage of females (74%) than males (100%) at large 1 year and recaptured on the spawning grounds had formed a recognizable annulus, but there was no significant difference between females (86%) and males (91%) recaptured by anglers. The significantly lower annulus recognition for annual female spawners was attributed to their demonstrated slower growth rate and possibly resorption of minimal marginal scale growth.Spawning checks were recognizable on the scales of 69–100% of 97 males and 49–78% of 187 females recaptured. Male salmon recaptured on the spawning grounds formed a significantly higher percentage of recognizable spawning checks than females (both annual and biennial spawners), but there were no significant differences between sexes for angler-recaptured fish. Lower reliability in spawning check recognition for females was attributed to less severe marginal resorption resulting in no spawning check being formed or obliteration of previous spawning checks by resorption of the small amount of marginal scale increment made by some annually spawning females, or both.

Cardiorespiratory responses of seawater-acclimated adult Arctic char (Salvelinus alpinus) and Atlantic salmon (Salmo salar) to an acute temperature increase

2014 ◽  
Vol 71 (7) ◽  
pp. 1096-1105 ◽  
Author(s):  
Chantelle M. Penney ◽  
Gordon W. Nash ◽  
A. Kurt Gamperl
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Temperature Increase ◽  
Thermal Tolerance ◽  
Salvelinus Alpinus ◽  
Arctic Char ◽  
Acclimation Temperature ◽  
Atlantic Salmon Salmo Salar ◽  
Interspecific Differences ◽  
Significant Difference

In this first study examining the thermal tolerance of adult Arctic char (Salvelinus alpinus) acclimated to seawater, we measured their critical thermal maximum (CTMax) and several cardiorespiratory parameters (oxygen consumption (MO2), heart rate (fH), stroke volume (SV), cardiac output (Q), ventilatory frequency (VF), opercular pressure (PO), and ventilatory effort (VE)) when exposed to a temperature increase of 2 °C·h−1. Further, we directly compared these results with those obtained for the eurythermal Atlantic salmon (Salmo salar) under identical conditions. There was no significant difference in cardiorespiratory values between the two species at their acclimation temperature (9.5–10 °C). In contrast, the slope of the MO2–temperature relationship was lower (by 27%) in the char as compared with that in the salmon, and the char had significantly lower values for maximum fH (by 13%), maximum MO2 (by 35%), absolute metabolic scope (by 39%), and CTMax (approximately 23 versus 26.5 °C, respectively). Although not a focus of the study, preliminary data suggest that interspecific differences in mitochondrial respiration (oxidative phosphorylation), and its temperature sensitivity, may partially explain the difference in thermal tolerance between the two species. These results provide considerable insights into why Atlantic salmon are displacing Arctic char in the current era of accelerated climate change.

Trace Element Analysis of Scales from Four Populations of Norwegian Atlantic Salmon (Salmo Salar L.) for Stock Identification Using Laser Ablation Inductively Coupled Plasma Mass Spectrometry

2005 ◽  
Vol 59 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Belinda Flem ◽  
Vidar Moen ◽  
Andreas Grimstvedt
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Atlantic Salmon ◽  
Elemental Composition ◽  
Fresh Water ◽  
Salmo Salar ◽  
Inductively Coupled Plasma ◽  
Inductively Coupled ◽  
Atlantic Salmon Salmo Salar ◽  
Plasma Mass Spectrometry

The pre-smolt stage of the scale of adult Norwegian Atlantic salmon from four populations, encompassing both farmed and wild hatchery stocks, has been analyzed by laser ablation inductively coupled plasma mass spectrometry (LA-HR-ICP-MS). The purpose of this study was to test for differences in elemental composition between stocks of Atlantic salmon that have lived in separate fresh water locations until the smoltification and natural run out or transportation to the sea-cages. The populations studied were from fish farms located at Bremanger and Sørfold, a cultivated stock from Mossa, and one wild local stock from the river Gaula. The following elements were included in the analytical protocol: Li, Mg, Ca, Cr, Mn, Fe, Zn, Sr, Ba, Pb, and U. Calcium was used as a natural internal standard. Classification of the analytical data is studied by multivariate statistical techniques such as principal component analysis (PCA). We have been able to delineate the population of Atlantic salmon ( Salmo salar L.) from Gaula and Mossa from the Bremanger and the Sørfold stock based on the ten elements analyzed. The Bremanger and Sørfold stocks were partially delineated. The differences in elemental composition in the scales, which makes the delineating of the four stocks possible, probably reflects geological differences in the bedrock at the four fresh water locations experienced by the salmon during the pre-smolt stage.

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