scholarly journals The gill parasite Paramoeba perurans compromises aerobic scope, swimming capacity and ion balance in Atlantic salmon

2017 ◽  
Vol 5 (1) ◽  
Author(s):  
Malthe Hvas ◽  
Egil Karlsbakk ◽  
Stig Mæhle ◽  
Daniel William Wright ◽  
Frode Oppedal
Keyword(s):  
Atlantic Salmon ◽  
Aerobic Scope ◽  
Ion Balance ◽  
Gill Parasite ◽  
Swimming Capacity

A Study of Major Cations, Osmotic Pressure, andpH in Seminal Components of Atlantic Salmon

1969 ◽  
Vol 26 (2) ◽  
pp. 413-419 ◽  
Author(s):  
P. C. Hwang ◽  
D. R. Idler
Keyword(s):  
Atlantic Salmon ◽  
Osmotic Pressure ◽  
Seminal Plasma ◽  
Atlantic Cod ◽  
Glucose Solution ◽  
Limited Data ◽  
Ion Balance ◽  
Major Cations ◽  
Cryo Preservation

Certain properties of semen, spermatozoa, and seminal plasma of Atlantic salmon were investigated to facilitate the development of an extender for the cryo-preservation of sperm. The seminal plasma of 10 fish had an average pH of 8.25, an osmotic pressure of 232 milliosmols, and contained 237, 86, 5.2, and 2.2 mg/100 g respectively of Na+, K+, Ca++, and Mg++. The corresponding values for spermatozoa were 84, 298, 1.5, and 18.7. Storage of semen at 2 C caused an increase of Na+and Ca++and a decrease of K+and Mg++in spermatozoa. Subsequent incubation in glucose solution did not restore ion balance in salmon spermatozoa as it did in dog spermatozoa. The results for salmon are compared with limited data for Atlantic cod.

scholarly journals Assessing swimming capacity and schooling behaviour in farmed Atlantic salmon Salmo salar with experimental push-cages

Aquaculture ◽  
2017 ◽  
Vol 473 ◽  
pp. 423-429 ◽  
Author(s):  
Malthe Hvas ◽  
Ole Folkedal ◽  
David Solstorm ◽  
Tone Vågseth ◽  
Jan Olav Fosse ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
Schooling Behaviour ◽  
Farmed Atlantic Salmon ◽  
Swimming Capacity

scholarly journals Sustained swimming capacity of Atlantic salmon

2017 ◽  
Vol 9 ◽  
pp. 361-369 ◽  
Author(s):  
M Hvas ◽  
F Oppedal
Keyword(s):  
Atlantic Salmon ◽  
Swimming Capacity

scholarly journals Energetic costs of ectoparasite infection in Atlantic salmon

2021 ◽  
Author(s):  
Malthe Hvas ◽  
Samantha Bui
Keyword(s):  
Atlantic Salmon ◽  
Positive Impact ◽  
Ecological Impact ◽  
Infected Fish ◽  
Energy Budgets ◽  
Metabolic Rates ◽  
Aerobic Scope ◽  
Energetic Costs ◽  
Host Interaction ◽  
Parasite Infections

Parasites are widespread in nature where they affect energy budgets of hosts, and depending on the imposed pathogenic severity, this may reduce host fitness. However, the energetic costs of parasite infections are rarely quantified. In this study, we measured metabolic rates in recently seawater adapted Atlantic salmon (Salmo salar) infected with the ectoparasitic copepod Lepeophtheirus salmonis and used an aerobic scope framework to assess the potential ecological impact of this parasite-host interaction. The early chalimus stages of L. salmonis did not affect either standard or maximum metabolic rates. However, the later mobile pre-adult stages caused an increase in both standard and maximum metabolic rate yielding a preserved aerobic scope. Notably, standard metabolic rates were elevated by 26%, presumably caused by increased osmoregulatory burdens and costs of mobilizing immune responses. The positive impact on maximum metabolic rates was unexpected and suggests that fish are able to transiently overcompensate energy production to endure the burden of parasites and thus allow for continuation of normal activities. However, infected fish are known to suffer reduced growth, and this suggests that a trade-off exists in acquisition and assimilation of resources despite of an uncompromised aerobic scope. As such, when assessing impacts of environmental or biotic factors, we suggest that elevated routine costs may be a stronger predictor of reduced fitness than the available aerobic scope. Furthermore, studying effects on parasitized fish in an ecophysiological context deserves more attention, especially considering interacting effects of other stressors in the Anthropocene.

Microstructure and texture of fresh and smoked Atlantic salmon, Salmo salar L., fillets from fish reared and slaughtered under different conditions

2001 ◽  
Vol 32 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Sjofn Sigurgisladottir ◽  
Margret S. Sigurdardottir ◽  
Helga Ingvarsdottir ◽  
Ole J. Torrissen ◽  
Hannes Hafsteinsson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar

Marine mammals are natural hosts of Oceanivirga salmonicida, a bacterial pathogen of Atlantic salmon

2020 ◽  
Vol 139 ◽  
pp. 161-174
Author(s):  
R Palmer ◽  
GTA Fleming ◽  
S Glaeser ◽  
T Semmler ◽  
A Flamm ◽  
...  
Keyword(s):  
16S Rrna ◽  
Atlantic Salmon ◽  
16S Rrna Gene ◽  
Marine Mammals ◽  
Rrna Gene ◽  
Bacterial Disease ◽  
Common Dolphin ◽  
Stenella Coeruleoalba ◽  
Striped Dolphin ◽  
Natural Hosts

During 1992 and 1993, a bacterial disease occurred in a seawater Atlantic salmon Salmo salar farm, causing serious mortalities. The causative agent was subsequently named as Oceanivirga salmonicida, a member of the Leptotrichiaceae. Searches of 16S rRNA gene sequence databases have shown sequence similarities between O. salmonicida and uncultured bacterial clones from the digestive tracts of marine mammals. In the current study, oral samples were taken from stranded dolphins (common dolphin Delphinus delphis, striped dolphin Stenella coeruleoalba) and healthy harbour seals Phoca vitulina. A bacterium with growth characteristics consistent with O. salmonicida was isolated from a common dolphin. The isolate was confirmed as O. salmonicida, by comparisons to the type strain, using 16S rRNA gene, gyrB, groEL, and recA sequence analyses, average nucleotide identity analysis, and MALDI-TOF mass spectrometry. Metagenomic analysis indicated that the genus Oceanivirga represented a significant component of the oral bacterial microbiomes of the dolphins and seals. However, sequences consistent with O. salmonicida were only found in the dolphin samples. Analyses of marine mammal microbiome studies in the NCBI databases showed sequences consistent with O. salmonicida from the common dolphin, striped dolphin, bottlenose dolphin Tursiops truncatus, humpback whale Megaptera novaeangliae, and harbour seal. Sequences from marine environmental studies in the NCBI databases showed no sequences consistent with O. salmonicida. The findings suggest that several species of marine mammals are natural hosts of O. salmonicida.

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